Any time you want some specific even with very high accuracy. Shortcut combos don't always work/trigger at the right time/in the right focus context. Or if you

Any time you want some specific even with very high accuracy. Shortcut combos don't always work/trigger at the right time/in the right focus context. Or if you have a QMK with altogether too many virtual keys - I have like 60 x 7 layers = 420 possible two-thumb-one-finger events, I don't use them all but I still lose track. I'm thinking of building one of these for things like "jump focus to chat window and mute". Also it saddens me we have a speaker mute keycode but no system-wide mute mic.