It can certainly be done by interfacing with the X server, but it limits you to systems with a running X server (e.g. no headless raspberry PI's, no Wayland).

It can certainly be done by interfacing with the X server, but it limits you to systems with a running X server (e.g. no headless raspberry PI's, no Wayland). I have a planned change to use this a default, and fall back to /dev/input on non-X systems. It's not quite there yet, especially the capability of suppressing key events.