Support additional customisation in custom_config.h

[manna-harbour]

• [ ] change tapping term
• [ ] mods customisation https://github.com/manna-harbour/miryoku/issues/33
• [ ] custom clipboard? including https://github.com/manna-harbour/miryoku/issues/33#issuecomment-1046352863
• [ ] disable reset, default layer, layer lock? https://github.com/manna-harbour/miryoku/discussions/93
• [ ] custom key emulation combos for added and substituted layers
• [ ] disable auto shift, including https://github.com/manna-harbour/miryoku/issues/36
• [ ] https://github.com/manna-harbour/miryoku/issues/35
• [ ] encoder rotations
• [ ] also add custom_keymap.c / custom_keymap.dtsi for custom code / behaviours.
• [ ] additional custom combos https://github.com/manna-harbour/miryoku/issues/94#issuecomment-1150546555 https://github.com/manna-harbour/miryoku/discussions/233 https://github.com/manna-harbour/miryoku/discussions/289
• [ ] additional custom macros https://github.com/manna-harbour/miryoku/discussions/233 https://github.com/manna-harbour/miryoku/discussions/290
• [ ] additional custom mod-morph / key overrides https://github.com/manna-harbour/miryoku/discussions/279

[manna-harbour]

@agisga Continuing from https://github.com/manna-harbour/miryoku/discussions/85#discussioncomment-2834628. There's no extra support for custom combos in Miryoku QMK at the moment, but they can be added in manna-harbour_miryoku.c as you've been doing without too much risk of merge conflicts. I may add custom_keymap.c or similar for custom userspace code such as this. But in Miryoku ZMK I've defined macros for the key emulation combos, so something like that in Miryoku ZMK and Miryoku QMK for user combos might help. Or to keep it in custom_config.h only it could be done via X macros in the same way as the layer list.

[nodupe]

Hi, is there still a plan for adding custom_keymap.c? That would be really cool.