This is an interesting idea, thanks for the suggestion! I’m much less experienced working with hardware solutions like this, but this might be a good chance to learn something different. Anecdotally, it seems like there may be some issues with anti cheat software that blocks Arduino input, but that may not end up being a problem for me.

I’ve read through a few different projects and it certainly seems like this would work. Are there any specific projects you would recommend that might help get me on the right path? I’m going to try to work with a custom command plus key bind as a primary solution, but it would be nice to try a couple different approaches.

Thanks very much for explaining a bit about Sway and compositors in general - that makes more sense now!

I did find the keyboard shortcuts exactly as you described, that’s something I didn’t know about before! Unfortunately, I don’t think the mouse speed setting is exactly as it sounds: Pointer speed for mice. Accepted values are in the [-1..1] range (from “unaccelerated” to “fast”). A value of 0 is the system default. It looks like it’s related to the acceleration, not the base movement speed. When I tested, even a value of -1 only slows the mouse instead of stopping it completely. There may be something else that will work, knowing that a custom shortcut exists that can execute a command does open up options I haven’t looked at yet.