Mask off keycode/layer/mod where possible in LT(), MT(), etc. (#3430)

* Mask off keycode/layer/mod where possible in LT(), MT(), etc.

* Don't need these parentheses

* Put back parentheses for order of operations

1 files changed, 4 insertions, 6 deletions

diff --git a/docs/feature_advanced_keycodes.md b/docs/feature_advanced_keycodes.md
index f93b8033a5..5713234be1 100644
--- a/docs/feature_advanced_keycodes.md
+++ b/docs/feature_advanced_keycodes.md
@@ -13,9 +13,11 @@ People often define custom names using `#define`. For example:
 
 This will allow you to use `FN_CAPS` and `ALT_TAB` in your `KEYMAP()`, keeping it more readable.
 
-### Limits of These Aliases
+### Caveats
 
-Currently, the keycodes able to used with these functions are limited to the [Basic Keycodes](keycodes_basic.md), meaning you can't use keycodes like `KC_TILD`, or anything greater than 0xFF. For a full list of the keycodes able to be used see [Basic Keycodes](keycodes_basic.md).
+Currently, `LT()` and `MT()` are limited to the [Basic Keycode set](keycodes_basic.md), meaning you can't use keycodes like `LCTL()`, `KC_TILD`, or anything greater than `0xFF`. Modifiers specified as part of a Layer Tap or Mod Tap's keycode will be ignored.
+
+Additionally, if at least one right-handed modifier is specified in a Mod Tap or Layer Tap, it will cause all modifiers specified to become right-handed, so it is not possible to mix and match the two.
 
 # Switching and Toggling Layers
 
@@ -103,10 +105,6 @@ We've added shortcuts to make common modifier/tap (mod-tap) mappings more compac
   * `LCAG_T(kc)` - is CtrlAltGui when held and *kc* when tapped
   * `MEH_T(kc)` - is like Hyper, but not as cool -- does not include the Cmd/Win key, so just sends Alt+Ctrl+Shift.
 
-?> Due to the way that keycodes are structured, any modifiers specified as part of `kc`, such as `LCTL()` or `KC_LPRN`, will only activate when held instead of tapped.
-
-?> Additionally, if there is at least one right-handed modifier, any other modifiers in a chain of functions will turn into their right-handed equivalents, so it is not possible to "mix and match" the two.
-
 # One Shot Keys
 
 One shot keys are keys that remain active until the next key is pressed, and then are released. This allows you to type keyboard combinations without pressing more than one key at a time. These keys are usually called "Sticky keys" or "Dead keys".