There really isn't much more you can do. From there, I have aquired an F AT and modded it to where the number pad is a 4x5 matrix to allow full number pad functionality, along with arrows. I have also floss modded it with paracord core strands, and removed it from the case and mounted it in my desk.
After that, no, M to me doesn't feel good. I would rather type on linears with MX clear springs than M.