Anyway, extracting the Interface.bsa yields some txt files and some swf files. Haven't experimented with the swfs yet (might be possible to reverse engineer them, alter them, and re-export as swf). The txt files have the button mapping info.
This is one of the only mods I can think of that could be created without the TESCS, so anyone who is itching to try something might want to have a crack at it (if not, then I might later today)