sticky_key_modtap (OneShot Shift)

This is a well-known and common ergonomic technique in the ZMK custom keyboard community.

1. Sticky Key Mod-Tap is a hybrid behavior combining two powerful functions.

2. A quick tap sends a normal key (e.g., the letter 'A').

3. A brief hold activates a One-Shot Modifier (Shift, Ctrl, etc.).

4. This sticky modifier stays active just long enough for the next keypress, then automatically releases.

5. It significantly reduces finger strain by eliminating the need to hold down modifier keys for chording.