Customisable Vicinae-only modifier (Hyper Key)

Is your feature request related to a problem? Please describe.

Typically, regular modifier keys (e.g. Win, Cmd, etc) are bound to OS functions, leaving little room for Vicinae binds without conflicts.

Describe the solution you'd like

A feature where you can bind something like holding down Caps Lock to a custom Vicinae-only modifier, which would then be called the Hyper Key or something similar. This wouldn't disable Caps Lock functionality as short presses would still register as the original key.

This way, you could do something like Hyper (holding Caps Lock) + B to launch your browser. This would also be great for people using keyboard-centric window managers on Linux.

Raycast already has this functionality: https://manual.raycast.com/hyper-key

Describe alternatives you've considered

You can do keyboard rebinding config per-OS, but to implement something like the Hyper Key properly, I found it to be very tedious and a fragile solution.

Additional context

N/A