Numpad movement
Currently, moving with the numpad works only for the lateral directions since without numlock the numpad 2, 4, 6 and 8 keys resolve to the arrow keys. Binding diagonal movement to the Home, End, PageUp and PageDown keys would allow for diagonal movement as well.
Alternatively we could figure out how to treat the numpad keys as their own keys and bind them explicitly to movement (or something else), but I have no idea if that's possible.