I think the main thing I would like to see is a smarter selection system in general, pattern select, edge loop select, etc. There is an edge loop selection script I found but it's not very smart and something more like how Modo or Blender works would be quite nice.

Another feature would be a modifier stack system like in Blender or 3DsMax. Ideally a node based system. This is probably a v5 feature request though but having a more organized way to do non-destructive operations would be great.

Other than that I really enjoy using Moi, I can't think of a nurbs tool I would want to add to it but I'm still getting used to it.

- actually one thing I can think of is a custom pie menu like in Maya or Blender so I can switch between some tools on my tablet a bit quicker.