zmkfirmware
feat(behaviors): add universal snap tap behavior for gaming SOCD
Implements SOCD (Simultaneous Opposing Cardinal Directions) functionality that provides competitive gaming advantages through "last key wins" behavior for opposing directional keys.
Features:
- Universal syntax: &st
<opposing_key> works with any key pair - Dynamic state management supports up to 16 key pairs simultaneously
- Memory efficient: only stores state for active pairs
- Gaming optimized: perfect for FPS strafing, platformer movement, MOBA control
- Zero performance impact when behavior is not used
Usage example: &st A D // A key with D as opposing key &st W S // W key with S as opposing key
The behavior solves the problem where pressing opposing keys (like A+D) causes character to stop moving by automatically releasing the previous key when its opposing key is pressed, enabling instant direction changes without dead zones
This seems a bit specific to me for a built-in behavior in ZMK. See modules like https://github.com/nguyendown/zmk-behavior-socd for an out-of-tree implementation.
