I don't know why I didn't think of that. I use xbindkeys for other things.
In any case, it doesn't work; seems to only get keyboard and mouse events, and the manpage doesn't seem to indicate I could connect it to other events.
That's exactly like what I would be looking for, though, so I'm now hunting around for something similar to xev/xbindkeys that can watch /dev/input/event* and uinput.
