It would be really helpful if we could remap all buttons rather than just the M buttons. This feels like a pretty basic feature that's missing.
Similarly, could we please get the ability to bind the buttons (even if it's just the M buttons) as keyboard keys. That's yet another feature that I sorely miss from my Elite 2. There are a handful of games where it's very useful to have the extra buttons do different things such as in Party Animals which has no inbuilt text chat on console unless you press the 'enter' key. I am now yet again incapable of text chat in the game because of my my controller change.
Aside from that, I love my switch to Razer.