Update personal userspace and keymaps + improve custom functionality (#5289)

* Change how desktop commands work

* Add DST_MOD_MASK as a config option

* DST_RMV → DST_REM

* Add melody96:konstantin keymap

* Update custom SEND_STRING

* Move feature flags from userspace into keyboard rules

* Use "Vo-", "Vo+" instead of "VoD", "VoU" in keymap comments

* Add RGB controls and numpad Unicode to Melody96 keymap

* Add RGB_SET keycode to Melody96 and RGB files to userspace

* Generate UNICODE and UNICODEMAP constants using macros

* Avoid collisions with X_* send string constants

* Use two spaces before inline comments

* Add _keymap versions of other custom Quantum functions

Not added: eeconfig_update_keymap, eeconfig_read_keymap

* Switch to UNICODEMAP in keyboard rules

* Make toggle_numpad a nested function in process_record_user

* Set Melody96 underglow color to Godspeed blue on EEPROM reset

* Remove most _keymap and _user definitions in userspace

Some keyboards misuse _user functions by defining them in the base files
instead of the corresponding _kb functions (especially led_set_user and
matrix_init_user). Until this is fixed (#5148), I've removed definitions
in my userspace that could cause linking collisions.

* Update GODSPEED_BLUE values and RGB mode keys

* Add GODSPEED_YELLOW color

* Set preferred intervals for rgblight effects

* Update tap dance function names

* Replace td_lshift_fn with generic td_mod_layer, add TD_RCTL_FN

Move TD_FN_RCTL after TD_RCTL_FN

* Replace td_fn_rctrl with generic td_layer_mod

* Add blank lines, prefer explicit initialization

* ACTION_TAP_DANCE_DOUBLE_MODS → ACTION_TAP_DANCE_DOUBLE_MOD

* Update Godspeed colors

* Add media controls to Melody96 keymap

* Add SysRq, Break combos and other keys to Melody96 keymap

16 files changed, 354 insertions, 99 deletions

diff --git a/keyboards/kbdfans/kbd6x/keymaps/konstantin/keymap.c b/keyboards/kbdfans/kbd6x/keymaps/konstantin/keymap.c
index fa324be9a1..3404cc4e49 100644
--- a/keyboards/kbdfans/kbd6x/keymaps/konstantin/keymap.c
+++ b/keyboards/kbdfans/kbd6x/keymaps/konstantin/keymap.c
@@ -56,9 +56,9 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┤
    * │      │ ← │ ↓ │ → │PgD│   │   │   │MW↑│M← │M↓ │M→ │        │
    * ├──────┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┤
-   * │        │Mut│VoD│VoU│Ply│Prv│Nxt│MW←│MW→│M4 │M5 │      │   │
+   * │        │Mut│Vo-│Vo+│Ply│Prv│Nxt│MW←│MW→│M4 │M5 │      │   │
    * └─────┬──┴┬──┴──┬┴───┴───┴───┴───┴───┴───┴──┬┴───┴┬───┬─┴───┘
-   *       │   │     │            MW↓            │MAcl2│   │
+   *       │DPR│DstNA│            MW↓            │MAcl2│   │
    *       └───┴─────┴───────────────────────────┴─────┴───┘
    */
   [L_FN] = LAYOUT(
@@ -66,7 +66,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     _______, KC_HOME, KC_UP,   KC_END,  KC_PGUP, _______, _______, _______, _______, KC_BTN1, KC_MS_U, KC_BTN2, KC_BTN3, KC_DEL,
     _______, KC_LEFT, KC_DOWN, KC_RGHT, KC_PGDN, _______, _______, _______, KC_WH_U, KC_MS_L, KC_MS_D, KC_MS_R, _______,
     _______, KC_MUTE, KC_VOLD, KC_VOLU, KC_MPLY, KC_MPRV, KC_MNXT, KC_WH_L, KC_WH_R, KC_BTN4, KC_BTN5, _______, _______,
-    XXXXXXX, _______, _______,                   KC_WH_D,                   KC_ACL2, _______, XXXXXXX
+    XXXXXXX, DST_P_R, DST_N_A,                   KC_WH_D,                   KC_ACL2, _______, XXXXXXX
   ),
 
   /* RCtrl layer
@@ -79,7 +79,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    * ├──────┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┤
    * │        │   │   │   │   │   │   │   │   │   │   │      │   │
    * └─────┬──┴┬──┴──┬┴───┴───┴───┴───┴───┴───┴──┬┴───┴┬───┬─┴───┘
-   *       │Dst│Dstp←│                           │Dstp→│   │
+   *       │DtR│DstA │                           │     │   │
    *       └───┴─────┴───────────────────────────┴─────┴───┘
    */
   [L_RCTRL] = LAYOUT(
@@ -87,6 +87,6 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     _______, TOP,     MV_UP,   BOTTOM,  PRV_TAB, _______, _______, _______, _______, _______, _______, _______, _______, CLEAR,
     _______, MV_LEFT, MV_DOWN, MV_RGHT, NXT_TAB, _______, _______, _______, _______, _______, _______, _______, _______,
     _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
-    XXXXXXX, DESKTOP, DSKTP_L,                   _______,                   DSKTP_R, _______, XXXXXXX
+    XXXXXXX, DST_REM, DST_ADD,                   _______,                   _______, _______, XXXXXXX
   ),
 };
diff --git a/keyboards/kbdfans/kbd6x/keymaps/konstantin/rules.mk b/keyboards/kbdfans/kbd6x/keymaps/konstantin/rules.mk
index a45a631dc0..4e485bf766 100644
--- a/keyboards/kbdfans/kbd6x/keymaps/konstantin/rules.mk
+++ b/keyboards/kbdfans/kbd6x/keymaps/konstantin/rules.mk
@@ -1,2 +1,11 @@
+BOOTMAGIC_ENABLE  = no
+COMMAND_ENABLE    = yes
+CONSOLE_ENABLE    = yes
+EXTRAKEY_ENABLE   = yes
+MOUSEKEY_ENABLE   = yes
+NKRO_ENABLE       = yes
+TAP_DANCE_ENABLE  = yes
+UNICODEMAP_ENABLE = yes
+
 BACKLIGHT_ENABLE = no
 RGBLIGHT_ENABLE  = no
diff --git a/keyboards/melody96/keymaps/konstantin/config.h b/keyboards/melody96/keymaps/konstantin/config.h
new file mode 100644
index 0000000000..4b511eb848
--- /dev/null
+++ b/keyboards/melody96/keymaps/konstantin/config.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#define LAYER_FN
diff --git a/keyboards/melody96/keymaps/konstantin/keymap.c b/keyboards/melody96/keymaps/konstantin/keymap.c
new file mode 100644
index 0000000000..1150e5dc79
--- /dev/null
+++ b/keyboards/melody96/keymaps/konstantin/keymap.c
@@ -0,0 +1,78 @@
+#include QMK_KEYBOARD_H
+#include "konstantin.h"
+
+static const hsv_t *colors[] = { &GODSPEED_BLUE, &GODSPEED_YELLOW };
+static size_t cnum = sizeof colors / sizeof *colors;
+static size_t cidx = 0;
+
+void eeconfig_init_keymap(void) {
+  rgblight_sethsv(colors[cidx]->h, colors[cidx]->s, colors[cidx]->v);
+}
+
+enum keycodes_keymap {
+  RGB_SET = RANGE_KEYMAP,
+};
+
+bool process_record_keymap(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+  case RGB_SET:
+    if (record->event.pressed) {
+      cidx = (cidx + 1) % cnum;
+      rgblight_sethsv(colors[cidx]->h, colors[cidx]->s, colors[cidx]->v);
+    }
+    return false;
+
+  default:
+    return true;
+  }
+}
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  /* Base layer
+   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐
+   * │Esc│F1 │F2 │F3 │F4 │F5 │F6 │F7 │F8 │F9 │F10│F11│F12│PSc│Ins│Hom│End│PgU│PgD│
+   * ├───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┤
+   * │ ` │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ 9 │ 0 │ - │ = │ \ │Del│NLk│P/ │P* │P- │
+   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┼───┼───┼───┼───┤
+   * │ Tab │ Q │ W │ E │ R │ T │ Y │ U │ I │ O │ P │ [ │ ] │Bspc │P7 │P8 │P9 │   │
+   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┼───┼───┼───┤P+ │
+   * │FnCaps│ A │ S │ D │ F │ G │ H │ J │ K │ L │ ; │ ' │ Enter  │P4 │P5 │P6 │   │
+   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┼───┼───┼───┼───┤
+   * │LSft│RAG│ Z │ X │ C │ V │ B │ N │ M │ , │ . │ / │RShift│ ↑ │P1 │P2 │P3 │   │
+   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┴┬──┴──┬───┼───┼───┼───┼───┤PEn│
+   * │LCtl│LGui│LAlt│         Space          │RAlGu│RCtrl│ ← │ ↓ │ → │P0 │P. │   │
+   * └────┴────┴────┴────────────────────────┴─────┴─────┴───┴───┴───┴───┴───┴───┘
+   */
+  [L_BASE] = LAYOUT( \
+    KC_ESC,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_PSCR, KC_INS,  KC_HOME, KC_END,  KC_PGUP, KC_PGDN,
+    KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSLS, KC_DEL,  KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
+    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSPC,          KC_P7,   KC_P8,   KC_P9,   XXXXXXX,
+    FN_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT, KC_ENT,                    KC_P4,   KC_P5,   KC_P6,   KC_PPLS,
+    KC_LSFT, RAL_RGU, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,          KC_UP,   KC_P1,   KC_P2,   KC_P3,   XXXXXXX,
+    KC_LCTL, KC_LGUI, KC_LALT,                            KC_SPC,                             RAL_RGU, XXXXXXX, KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT, KC_P0,   KC_PDOT, KC_PENT
+  ),
+
+  /* Function layer
+   * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐
+   * │   │   │   │   │   │   │   │   │   │   │   │   │   │Sys│SLk│Pau│Brk│Top│Btm│
+   * ├───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┤
+   * │   │   │   │   │   │   │   │   │   │   │   │   │   │   │   │RTg│ ÷ │ × │ − │
+   * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┼───┼───┼───┼───┤
+   * │ M4  │M2 │M↑ │M1 │M3 │M5 │   │UCM│   │Stp│Ply│Prv│Nxt│Clear│RH+│RS+│RV+│   │
+   * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┼───┼───┼───┤RSt│
+   * │      │M← │M↓ │M→ │MW↑│   │   │   │   │   │   │   │        │RH-│RS-│RV-│   │
+   * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┼───┼───┼───┼───┤
+   * │    │   │MA0│MA2│MW←│MW→│   │   │   │Vo-│Vo+│Mut│      │PgU│RMR│RMS│RMB│   │
+   * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┴┬──┴──┬───┼───┼───┼───┼───┤RMP│
+   * │    │DtPR│DtNA│          MW↓           │     │ App │Hom│PgD│End│RM-│RM+│   │
+   * └────┴────┴────┴────────────────────────┴─────┴─────┴───┴───┴───┴───┴───┴───┘
+   */
+  [L_FN] = LAYOUT( \
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_SYSR, KC_SLCK, KC_PAUS, KC_BRK,  TOP,     BOTTOM,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, RGB_TOG, DIVIDE,  TIMES,   MINUS,
+    KC_BTN4, KC_BTN2, KC_MS_U, KC_BTN1, KC_BTN3, KC_BTN5, _______, UC_MOD,  _______, KC_MSTP, KC_MPLY, KC_MPRV, KC_MNXT, CLEAR,            RGB_HUI, RGB_SAI, RGB_VAI, XXXXXXX,
+    _______, KC_MS_L, KC_MS_D, KC_MS_R, KC_WH_U, _______, _______, _______, _______, _______, _______, _______, _______,                   RGB_HUD, RGB_SAD, RGB_VAD, RGB_SET,
+    _______, _______, KC_ACL0, KC_ACL2, KC_WH_L, KC_WH_R, _______, _______, _______, KC_VOLD, KC_VOLU, KC_MUTE, _______,          KC_PGUP, RGB_M_R, RGB_M_SN,RGB_M_B, XXXXXXX,
+    _______, DST_P_R, DST_N_A,                            KC_WH_D,                            _______, XXXXXXX, KC_APP,  KC_HOME, KC_PGDN, KC_END,  RGB_RMOD,RGB_MOD, RGB_M_P
+  ),
+};
diff --git a/keyboards/melody96/keymaps/konstantin/rules.mk b/keyboards/melody96/keymaps/konstantin/rules.mk
new file mode 100644
index 0000000000..47a859d089
--- /dev/null
+++ b/keyboards/melody96/keymaps/konstantin/rules.mk
@@ -0,0 +1,10 @@
+BOOTMAGIC_ENABLE  = no
+COMMAND_ENABLE    = yes
+CONSOLE_ENABLE    = no
+EXTRAKEY_ENABLE   = yes
+MOUSEKEY_ENABLE   = yes
+NKRO_ENABLE       = yes
+TAP_DANCE_ENABLE  = yes
+UNICODEMAP_ENABLE = yes
+
+BACKLIGHT_ENABLE = no
diff --git a/keyboards/whitefox/keymaps/konstantin/keymap.c b/keyboards/whitefox/keymaps/konstantin/keymap.c
index e37097361a..dddfb274e7 100644
--- a/keyboards/whitefox/keymaps/konstantin/keymap.c
+++ b/keyboards/whitefox/keymaps/konstantin/keymap.c
@@ -25,15 +25,15 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
   /* Function layer
    * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐
-   * │   │F1 │F2 │F3 │F4 │F5 │F6 │F7 │F8 │F9 │F10│F11│F12│Num│Scr│Pau│
+   * │   │F1 │F2 │F3 │F4 │F5 │F6 │F7 │F8 │F9 │F10│F11│F12│Num│SLk│Pau│
    * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┼───┤
    * │ M4  │M2 │M↑ │M1 │M3 │M5 │   │UCM│   │Stp│Ply│Prv│Nxt│Clear│Ins│
    * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┼───┤
    * │      │M← │M↓ │M→ │MW↑│   │   │   │   │   │   │   │        │Top│
    * ├──────┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┼───┤
-   * │        │MA0│MA2│MW←│MW→│   │   │   │VoD│VoU│Mut│ App  │PgU│Btm│
+   * │        │MA0│MA2│MW←│MW→│   │   │   │Vo-│Vo+│Mut│ App  │PgU│Btm│
    * ├────┬───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬─┬───┼───┼───┤
-   * │    │Dstp│Dst←│          MW↓           │Dst→│    │ │Hom│PgD│End│
+   * │    │DtPR│DtNA│          MW↓           │    │    │ │Hom│PgD│End│
    * └────┴────┴────┴────────────────────────┴────┴────┘ └───┴───┴───┘
    */
   [L_FN] = LAYOUT_truefox( \
@@ -41,7 +41,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     KC_BTN4, KC_BTN2, KC_MS_U, KC_BTN1, KC_BTN3, KC_BTN5, _______, UC_MOD,  _______, KC_MSTP, KC_MPLY, KC_MPRV, KC_MNXT, CLEAR,            KC_INS,  \
     _______, KC_MS_L, KC_MS_D, KC_MS_R, KC_WH_U, _______, _______, _______, _______, _______, _______, _______,          _______,          TOP,     \
     _______,          KC_ACL0, KC_ACL2, KC_WH_L, KC_WH_R, _______, _______, _______, KC_VOLD, KC_VOLU, KC_MUTE, KC_APP,           KC_PGUP, BOTTOM,  \
-    _______, DESKTOP, DSKTP_L,                            KC_WH_D,                   DSKTP_R, _______,                   KC_HOME, KC_PGDN, KC_END   \
+    _______, DST_P_R, DST_N_A,                            KC_WH_D,                   _______, _______,                   KC_HOME, KC_PGDN, KC_END   \
   ),
 
   /* Numpad layer
diff --git a/keyboards/whitefox/keymaps/konstantin/rules.mk b/keyboards/whitefox/keymaps/konstantin/rules.mk
index 1302f14ca8..625ef346c8 100644
--- a/keyboards/whitefox/keymaps/konstantin/rules.mk
+++ b/keyboards/whitefox/keymaps/konstantin/rules.mk
@@ -1,2 +1,11 @@
+BOOTMAGIC_ENABLE  = no
+COMMAND_ENABLE    = yes
+CONSOLE_ENABLE    = yes
+EXTRAKEY_ENABLE   = yes
+MOUSEKEY_ENABLE   = yes
+NKRO_ENABLE       = yes
+TAP_DANCE_ENABLE  = yes
+UNICODEMAP_ENABLE = yes
+
 BACKLIGHT_ENABLE  = no
 VISUALIZER_ENABLE = no
diff --git a/users/konstantin/konstantin.c b/users/konstantin/konstantin.c
index 47596279c3..753742fa78 100644
--- a/users/konstantin/konstantin.c
+++ b/users/konstantin/konstantin.c
@@ -1,15 +1,25 @@
 #include "konstantin.h"
 
-#ifdef LAYER_NUMPAD
-static void toggle_numpad(void) {
-  layer_invert(L_NUMPAD);
-  bool numpad_on = IS_LAYER_ON(L_NUMPAD);
-  bool num_lock_on = IS_HOST_LED_ON(USB_LED_NUM_LOCK);
-  if (num_lock_on != numpad_on) {
-    tap_code(KC_NLCK); // Toggle Num Lock to match layer state
-  }
+__attribute__((weak))
+void keyboard_pre_init_keymap(void) {}
+
+void keyboard_pre_init_user(void) {
+  keyboard_pre_init_keymap();
+}
+
+__attribute__((weak))
+void eeconfig_init_keymap(void) {}
+
+void eeconfig_init_user(void) {
+  eeconfig_init_keymap();
+}
+
+__attribute__((weak))
+void keyboard_post_init_keymap(void) {}
+
+void keyboard_post_init_user(void) {
+  keyboard_post_init_keymap();
 }
-#endif
 
 __attribute__((weak))
 bool process_record_keymap(uint16_t keycode, keyrecord_t *record) {
@@ -21,6 +31,16 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     return false;
   }
 
+#ifdef LAYER_NUMPAD
+  void toggle_numpad(void) {
+    layer_invert(L_NUMPAD);
+    bool numpad = IS_LAYER_ON(L_NUMPAD), num_lock = IS_HOST_LED_ON(USB_LED_NUM_LOCK);
+    if (num_lock != numpad) {
+      tap_code(KC_NLCK);  // Toggle Num Lock to match layer state
+    }
+  }
+#endif
+
   switch (keycode) {
   case CLEAR:
     if (record->event.pressed) {
@@ -28,12 +48,24 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     }
     return false;
 
+  case DST_P_R:
+    (record->event.pressed ? register_code16 : unregister_code16)(
+      (get_mods() & DST_MOD_MASK) ? DST_REM : DST_PRV
+    );
+    return false;
+
+  case DST_N_A:
+    (record->event.pressed ? register_code16 : unregister_code16)(
+      (get_mods() & DST_MOD_MASK) ? DST_ADD : DST_NXT
+    );
+    return false;
+
 #ifdef LAYER_FN
-  static bool fn_lock;
+    static bool fn_lock;
 
   case FN_FNLK:
     if (record->event.pressed && record->tap.count == TAPPING_TOGGLE) {
-      fn_lock = !IS_LAYER_ON(L_FN); // Fn layer will be toggled after this
+      fn_lock = !IS_LAYER_ON(L_FN);  // Fn layer will be toggled after this
     }
     return true;
 #endif
diff --git a/users/konstantin/konstantin.h b/users/konstantin/konstantin.h
index f67f9f1b7e..0639b93a6d 100644
--- a/users/konstantin/konstantin.h
+++ b/users/konstantin/konstantin.h
@@ -1,10 +1,13 @@
 #pragma once
 
 #include "quantum.h"
+#if defined(RGBLIGHT_ENABLE) || defined(RGBMATRIX_ENABLE)
+  #include "rgb.h"
+#endif
 #ifdef TAP_DANCE_ENABLE
   #include "tap_dance.h"
 #endif
-#ifdef UNICODE_ENABLE
+#if defined(UNICODE_ENABLE) || defined(UNICODEMAP_ENABLE)
   #include "unicode.h"
 #endif
 
@@ -14,6 +17,10 @@
   #define FN_FNLK TT(L_FN)
 #endif
 
+#define KC_SYSR LALT(KC_PSCR)
+#undef  KC_BRK
+#define KC_BRK  LCTL(KC_PAUS)
+
 #define MV_UP   LCTL(KC_UP)
 #define MV_DOWN LCTL(KC_DOWN)
 #define MV_LEFT LCTL(KC_LEFT)
@@ -23,20 +30,30 @@
 #define PRV_TAB LCTL(KC_PGUP)
 #define NXT_TAB LCTL(KC_PGDN)
 
+#define DST_ADD LCTL(LGUI(KC_D))
+#define DST_REM LCTL(LGUI(KC_F4))
+#define DST_PRV LCTL(LGUI(KC_LEFT))
+#define DST_NXT LCTL(LGUI(KC_RGHT))
+#ifndef DST_MOD_MASK
+  #define DST_MOD_MASK MOD_MASK_CTRL
+#endif
+
 #define LCT_CPS LCTL_T(KC_CAPS)
 
 #ifdef SEND_STRING_CLEAN
   #undef  SEND_STRING
-  #define SEND_STRING(...) {            \
-      uint8_t ss_mods = get_mods();     \
-      clear_mods();                     \
-      send_string_P(PSTR(__VA_ARGS__)); \
-      set_mods(ss_mods);                \
+  #define SEND_STRING(string) {     \
+      uint8_t ss_mods = get_mods(); \
+      clear_mods();                 \
+      send_string_P(PSTR(string));  \
+      set_mods(ss_mods);            \
     }
 #endif
 
 enum keycodes_user {
   CLEAR = SAFE_RANGE,
+  DST_P_R,
+  DST_N_A,
 #ifdef LAYER_NUMPAD
   NUMPAD,
 #endif
@@ -56,5 +73,9 @@ enum layers_user {
   L_RANGE_KEYMAP,
 };
 
+void keyboard_pre_init_keymap(void);
+void eeconfig_init_keymap(void);
+void keyboard_post_init_keymap(void);
+
 bool process_record_keymap(uint16_t keycode, keyrecord_t *record);
 uint32_t layer_state_set_keymap(uint32_t state);
diff --git a/users/konstantin/rgb.c b/users/konstantin/rgb.c
new file mode 100644
index 0000000000..0f0c73c49e
--- /dev/null
+++ b/users/konstantin/rgb.c
@@ -0,0 +1,24 @@
+#include "rgb.h"
+
+#ifdef RGBLIGHT_EFFECT_BREATHING
+const uint8_t RGBLED_BREATHING_INTERVALS[] PROGMEM = {20, 30, 5, 10};
+#endif
+
+#ifdef RGBLIGHT_EFFECT_RAINBOW_MOOD
+const uint8_t RGBLED_RAINBOW_MOOD_INTERVALS[] PROGMEM = {20, 50, 100};
+#endif
+
+#ifdef RGBLIGHT_EFFECT_RAINBOW_SWIRL
+const uint8_t RGBLED_RAINBOW_SWIRL_INTERVALS[] PROGMEM = {20, 50, 100};
+#endif
+
+#ifdef RGBLIGHT_EFFECT_SNAKE
+const uint8_t RGBLED_SNAKE_INTERVALS[] PROGMEM = {20, 50, 100};
+#endif
+
+#ifdef RGBLIGHT_EFFECT_KNIGHT
+const uint8_t RGBLED_KNIGHT_INTERVALS[] PROGMEM = {20, 50, 100};
+#endif
+
+const hsv_t GODSPEED_BLUE   = { .h = 280, .s = 68,  .v = RGBLIGHT_LIMIT_VAL };
+const hsv_t GODSPEED_YELLOW = { .h = 38,  .s = 153, .v = RGBLIGHT_LIMIT_VAL };
diff --git a/users/konstantin/rgb.h b/users/konstantin/rgb.h
new file mode 100644
index 0000000000..53b5821b0e
--- /dev/null
+++ b/users/konstantin/rgb.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "quantum.h"
+
+typedef struct {
+  uint16_t h;  // 0–360
+  uint8_t  s;  // 0–255
+  uint8_t  v;  // 0–255
+} hsv_t;
+
+typedef struct {
+  uint8_t r;  // 0–255
+  uint8_t g;  // 0–255
+  uint8_t b;  // 0–255
+} rgb_t;
+
+extern const hsv_t GODSPEED_BLUE;
+extern const hsv_t GODSPEED_YELLOW;
diff --git a/users/konstantin/rules.mk b/users/konstantin/rules.mk
index d2522b9523..6bda030fb0 100644
--- a/users/konstantin/rules.mk
+++ b/users/konstantin/rules.mk
@@ -1,15 +1,12 @@
-BOOTMAGIC_ENABLE   = no
-COMMAND_ENABLE     = yes
-CONSOLE_ENABLE     = yes
-EXTRAKEY_ENABLE    = yes
-MOUSEKEY_ENABLE    = yes
-NKRO_ENABLE        = yes
-TAP_DANCE_ENABLE   = yes
-UNICODE_ENABLE     = yes
-
 SRC += konstantin.c
+ifneq (,$(filter yes,$(RGBLIGHT_ENABLE) $(RGB_MATRIX_ENABLE)))  # if either is yes
+  SRC += rgb.c
+endif
 ifeq ($(strip $(TAP_DANCE_ENABLE)), yes)
   SRC += tap_dance.c
 endif
+ifneq (,$(filter yes,$(UNICODE_ENABLE) $(UNICODEMAP_ENABLE)))  # if either is yes
+  SRC += unicode.c
+endif
 
 EXTRAFLAGS += -flto
diff --git a/users/konstantin/tap_dance.c b/users/konstantin/tap_dance.c
index b13f33c024..0b405939b3 100644
--- a/users/konstantin/tap_dance.c
+++ b/users/konstantin/tap_dance.c
@@ -1,93 +1,117 @@
 #include "tap_dance.h"
 #include "konstantin.h"
 
-#define ACTION_TAP_DANCE_DOUBLE_MODS(mod1, mod2) { \
-    .fn = { td_double_mods_each, NULL, td_double_mods_reset }, \
-    .user_data = &(qk_tap_dance_pair_t){ mod1, mod2 }, \
+#define ACTION_TAP_DANCE_DOUBLE_MOD(mod1, mod2) {                   \
+    .fn        = { td_double_mod_each, NULL, td_double_mod_reset }, \
+    .user_data = &(qk_tap_dance_pair_t){ mod1, mod2 },              \
   }
 
-void td_double_mods_each(qk_tap_dance_state_t *state, void *user_data) {
-  qk_tap_dance_pair_t *mods = (qk_tap_dance_pair_t *)user_data;
+void td_double_mod_each(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_pair_t *data = (qk_tap_dance_pair_t *)user_data;
+
   // Single tap → mod1, double tap → mod2, triple tap etc. → mod1+mod2
   if (state->count == 1 || state->count == 3) {
-    register_code(mods->kc1);
+    register_code(data->kc1);
   } else if (state->count == 2) {
-    unregister_code(mods->kc1);
-    register_code(mods->kc2);
+    unregister_code(data->kc1);
+    register_code(data->kc2);
   }
-  // Prevent tap dance from sending kc1 and kc2 as weak mods
-  state->weak_mods &= ~(MOD_BIT(mods->kc1) | MOD_BIT(mods->kc2));
+  // Prevent tap dance from sending the mods as weak mods
+  state->weak_mods &= ~(MOD_BIT(data->kc1) | MOD_BIT(data->kc2));
 }
 
-void td_double_mods_reset(qk_tap_dance_state_t *state, void *user_data) {
-  qk_tap_dance_pair_t *mods = (qk_tap_dance_pair_t *)user_data;
+void td_double_mod_reset(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_pair_t *data = (qk_tap_dance_pair_t *)user_data;
+
   if (state->count == 1 || state->count >= 3) {
-    unregister_code(mods->kc1);
+    unregister_code(data->kc1);
   }
   if (state->count >= 2) {
-    unregister_code(mods->kc2);
+    unregister_code(data->kc2);
   }
 }
 
-struct {
-  bool fn_on; // Layer state when tap dance started
-  bool started;
-} td_fn_rctrl_data;
-
-void td_fn_rctrl_each(qk_tap_dance_state_t *state, void *user_data) {
-  if (!td_fn_rctrl_data.started) {
-    td_fn_rctrl_data.fn_on = IS_LAYER_ON(L_FN);
-    td_fn_rctrl_data.started = true;
+#define ACTION_TAP_DANCE_MOD_LAYER(mod, layer) {                  \
+    .fn        = { td_mod_layer_each, NULL, td_mod_layer_reset }, \
+    .user_data = &(qk_tap_dance_dual_role_t){ mod, layer },       \
   }
-  // Single tap → Fn, double tap → RCtrl, triple tap etc. → Fn+RCtrl
+
+void td_mod_layer_each(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_dual_role_t *data = (qk_tap_dance_dual_role_t *)user_data;
+
+  // Single tap → mod, double tap → layer, triple tap etc. → mod+layer
   if (state->count == 1 || state->count == 3) {
-    layer_on(L_FN);
+    register_code(data->kc);
   } else if (state->count == 2) {
-    if (!td_fn_rctrl_data.fn_on) {
-      layer_off(L_FN);
-    }
-    register_code(KC_RCTL);
+    unregister_code(data->kc);
+    // Prevent tap dance from sending the mod as a weak mod
+    state->weak_mods &= ~MOD_BIT(data->kc);
+    layer_on(data->layer);
   }
 }
 
-void td_fn_rctrl_reset(qk_tap_dance_state_t *state, void *user_data) {
-  if ((state->count == 1 || state->count >= 3) && !td_fn_rctrl_data.fn_on) {
-    layer_off(L_FN);
+void td_mod_layer_reset(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_dual_role_t *data = (qk_tap_dance_dual_role_t *)user_data;
+
+  if (state->count == 1 || state->count >= 3) {
+    unregister_code(data->kc);
   }
   if (state->count >= 2) {
-    unregister_code(KC_RCTL);
+    layer_off(data->layer);
   }
-  td_fn_rctrl_data.started = false;
 }
 
-void td_lsft_fn_each(qk_tap_dance_state_t *state, void *user_data) {
-  // Single tap → LShift, double tap → Fn, triple tap etc. → Fn+LShift
+#define ACTION_TAP_DANCE_LAYER_MOD(layer, mod) {                  \
+    .fn        = { td_layer_mod_each, NULL, td_layer_mod_reset }, \
+    .user_data = &(qk_tap_dance_layer_mod_t){ layer, mod, 0, 0 }, \
+  }
+
+typedef struct {
+  uint8_t  layer;
+  uint16_t kc;
+  bool     layer_on;  // Layer state when tap dance started
+  bool     started;
+} qk_tap_dance_layer_mod_t;
+
+void td_layer_mod_each(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_layer_mod_t *data = (qk_tap_dance_layer_mod_t *)user_data;
+  if (!data->started) {
+    data->layer_on = IS_LAYER_ON(data->layer);
+    data->started = true;
+  }
+
+  // Single tap → layer, double tap → mod, triple tap etc. → layer+mod
   if (state->count == 1 || state->count == 3) {
-    register_code(KC_LSFT);
+    layer_on(data->layer);
   } else if (state->count == 2) {
-    unregister_code(KC_LSFT);
-    // Prevent tap dance from sending LShift as a weak mod
-    state->weak_mods &= ~MOD_BIT(KC_LSFT);
-    layer_on(L_FN);
+    if (!data->layer_on) {
+      layer_off(data->layer);
+    }
+    register_code(data->kc);
   }
 }
 
-void td_lsft_fn_reset(qk_tap_dance_state_t *state, void *user_data) {
-  if (state->count == 1 || state->count >= 3) {
-    unregister_code(KC_LSFT);
+void td_layer_mod_reset(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_layer_mod_t *data = (qk_tap_dance_layer_mod_t *)user_data;
+
+  if ((state->count == 1 || state->count >= 3) && !data->layer_on) {
+    layer_off(data->layer);
   }
   if (state->count >= 2) {
-    layer_off(L_FN);
+    unregister_code(data->kc);
   }
+
+  data->started = false;
 }
 
 qk_tap_dance_action_t tap_dance_actions[] = {
-  [TD_DESKTOP] = ACTION_TAP_DANCE_DOUBLE(LCTL(LGUI(KC_D)), LCTL(LGUI(KC_F4))), // Add/close virtual desktop
+  [TD_DST_A_R] = ACTION_TAP_DANCE_DOUBLE(DST_ADD, DST_REM),
 
-  [TD_RAL_LAL] = ACTION_TAP_DANCE_DOUBLE_MODS(KC_RALT, KC_LALT),
-  [TD_RAL_RGU] = ACTION_TAP_DANCE_DOUBLE_MODS(KC_RALT, KC_RGUI),
-  [TD_RCT_RSF] = ACTION_TAP_DANCE_DOUBLE_MODS(KC_RCTL, KC_RSFT),
+  [TD_RAL_LAL] = ACTION_TAP_DANCE_DOUBLE_MOD(KC_RALT, KC_LALT),
+  [TD_RAL_RGU] = ACTION_TAP_DANCE_DOUBLE_MOD(KC_RALT, KC_RGUI),
+  [TD_RCT_RSF] = ACTION_TAP_DANCE_DOUBLE_MOD(KC_RCTL, KC_RSFT),
 
-  [TD_FN_RCTL] = ACTION_TAP_DANCE_FN_ADVANCED(td_fn_rctrl_each, NULL, td_fn_rctrl_reset),
-  [TD_LSFT_FN] = ACTION_TAP_DANCE_FN_ADVANCED(td_lsft_fn_each, NULL, td_lsft_fn_reset),
+  [TD_LSFT_FN] = ACTION_TAP_DANCE_MOD_LAYER(KC_LSFT, L_FN),
+  [TD_RCTL_FN] = ACTION_TAP_DANCE_MOD_LAYER(KC_RCTL, L_FN),
+  [TD_FN_RCTL] = ACTION_TAP_DANCE_LAYER_MOD(L_FN, KC_RCTL),
 };
diff --git a/users/konstantin/tap_dance.h b/users/konstantin/tap_dance.h
index 922a635141..ad7c04cb7f 100644
--- a/users/konstantin/tap_dance.h
+++ b/users/konstantin/tap_dance.h
@@ -2,24 +2,24 @@
 
 #include "quantum.h"
 
-#define DESKTOP TD(TD_DESKTOP)
-#define DSKTP_L LCTL(LGUI(KC_LEFT))
-#define DSKTP_R LCTL(LGUI(KC_RGHT))
+#define DST_A_R TD(TD_DST_A_R)
 
 #define RAL_LAL TD(TD_RAL_LAL)
 #define RAL_RGU TD(TD_RAL_RGU)
 #define RCT_RSF TD(TD_RCT_RSF)
 
-#define FN_RCTL TD(TD_FN_RCTL)
 #define LSFT_FN TD(TD_LSFT_FN)
+#define RCTL_FN TD(TD_RCTL_FN)
+#define FN_RCTL TD(TD_FN_RCTL)
 
 enum tap_dance {
-  TD_DESKTOP,
+  TD_DST_A_R,
 
   TD_RAL_LAL,
   TD_RAL_RGU,
   TD_RCT_RSF,
 
-  TD_FN_RCTL,
   TD_LSFT_FN,
+  TD_RCTL_FN,
+  TD_FN_RCTL,
 };
diff --git a/users/konstantin/unicode.c b/users/konstantin/unicode.c
new file mode 100644
index 0000000000..144c0aaf75
--- /dev/null
+++ b/users/konstantin/unicode.c
@@ -0,0 +1,7 @@
+#include "unicode.h"
+
+#ifdef UNICODEMAP_ENABLE
+const uint32_t PROGMEM unicode_map[] = {
+  FOREACH_UNICODE(UCM_ENTRY)
+};
+#endif
diff --git a/users/konstantin/unicode.h b/users/konstantin/unicode.h
index 09af7e1c7f..c8eddabb71 100644
--- a/users/konstantin/unicode.h
+++ b/users/konstantin/unicode.h
@@ -2,10 +2,33 @@
 
 #include "quantum.h"
 
-#define COMMA   UC(0x002C)
-#define L_PAREN UC(0x0028)
-#define R_PAREN UC(0x0029)
-#define EQUALS  UC(0x003D)
-#define TIMES   UC(0x00D7)
-#define DIVIDE  UC(0x00F7)
-#define MINUS   UC(0x2212)
+#define FOREACH_UNICODE(M) \
+  M(COMMA,   0x002C)       \
+  M(L_PAREN, 0x0028)       \
+  M(R_PAREN, 0x0029)       \
+  M(EQUALS,  0x003D)       \
+  M(TIMES,   0x00D7)       \
+  M(DIVIDE,  0x00F7)       \
+  M(MINUS,   0x2212)
+
+#define UC_KEYCODE(name, code)  name = UC(code),
+
+#define UCM_NAME(name, code)    UCM_ ## name,
+#define UCM_ENTRY(name, code)   [UCM_ ## name] = code,
+#define UCM_KEYCODE(name, code) name = X(UCM_ ## name),
+
+#if defined(UNICODE_ENABLE)
+enum unicode_keycodes {
+  FOREACH_UNICODE(UC_KEYCODE)
+};
+#elif defined(UNICODEMAP_ENABLE)
+enum unicode_names {
+  FOREACH_UNICODE(UCM_NAME)
+};
+
+extern const uint32_t PROGMEM unicode_map[];
+
+enum unicode_keycodes {
+  FOREACH_UNICODE(UCM_KEYCODE)
+};
+#endif