mhm... when you want to use more than the wasd-keys i would prefer following:

Q = left-up......, W = up......., E = right-up
A = left ..........., S = ............, D = right
Y = left-down..., X = down..., C = right-down

so you would only have to press one key at time to move around ^^

edit: with freely configurable mid-point for longer thumbs -> s d f g h (: