Tweaking HRMs in ZMK

[essFitt]

I was wondering what the scope is to tweak the home row mods. I have been using this awesome layout for a while now and still have misfires somewhat regularly when typing. I know some user adjustment is required, but I would like to also explore using positional hold/tap and hold/tap flavor: tap-unless-interrupted. Any advice would be much appreciated. Thanks for making this space so useful!

[manna-harbour]

The first things to try are to increase tapping term (https://github.com/manna-harbour/miryoku_zmk/blob/e6683e9f8b6c199b339208b1b501e88a7308ed48/miryoku/miryoku.h#L26), and to try to type with light snappy taps without lingering.

I plan on adding options for positional hold tap (https://zmk.dev/docs/behaviors/hold-tap#positional-hold-tap-and-hold-trigger-key-positions, https://zmk.dev/docs/behaviors/hold-tap#option-1-cross-hand-only-modifiers-using-tap-unless-interrupted-and-positional-hold-tap-hold-trigger-key-positions), and also for require-prior-idle-ms (https://zmk.dev/docs/behaviors/hold-tap#require-prior-idle-ms) with one shot shift on thumb, but you can try them now with some manual changes.

For positional hold tap, you'd add new behaviors for left and right hand mod tap with hold-trigger-key-positions and hold-trigger-on-release in https://github.com/manna-harbour/miryoku_zmk/blob/master/miryoku/miryoku_behaviors.dtsi using cpp macros for the key positions, define the macros in the mapping file (https://github.com/manna-harbour/miryoku_zmk#mapping-macros) as is done now for key substitution combo key positions, and substitute a custom Base layer (https://github.com/manna-harbour/miryoku_zmk#customisation) to include the new behaviors on the corresponding side. If you need more details just ask.

For require-prior-idle-ms, you can add the property in this section: https://github.com/manna-harbour/miryoku_zmk/blob/e6683e9f8b6c199b339208b1b501e88a7308ed48/miryoku/miryoku_behaviors.dtsi#L7-L11.

I suspect tap-unless-interrupted would not be helpful, but you could enable it in the same way.