WASD vs WAXD?
I've been figuring out twin stick keyboard controls for C64, and WAXD+UHMK works well with the keyboard matrix restrictions.
What do you think of WAXD instead of WASD? The big advantage is that you can place your thumb on X, so all four direction keys are simple presses. With WASD, you must shift your middle finger between W and S.
With WAXD, you can intuitively "steer" in all 8 directions as if you were tilting a pad under your four fingers.
