One suggestion is to allow for HJKL or WASD movement. Arrow keys are fine and intuitive, but not in the best location. I remember playing nethack years ago and it had the HJKL system.
I wonder sometimes how much playing moria drew me to VI over emacs.
Emacs' dealing poorly with choppy internet connections was the main reason I went back to vi very quickly after trying it, but it wasn't the only reason.
