I already used it to remap my mouse keys make the side buttons do volume up/down, tilt wheel to do forward/back and middle button do F5.
But I noticed my keyboard's right super key (Windows key) didn't do anything so I remapped it to do Super L. Now I can hit it to do a system search just like with the left one. It's quite a bit handier.
Edit: Just noticed you can switch it to the right key in Tweaks. I guess that is enough.