A short guide on remapping the rarely-used menu key to act as a second mod/super key in the niri Wayland compositor using only its built-in XKB config option `altwin:menu_win`. No extra tools like keyd or xremap are needed. The post explains the practical motivation (one-handed use), how to discover valid XKB option names via `/usr/share/X11/xkb/rules/evdev.lst`, and includes a demo video with timestamps.
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