In games which use rotary stick in arcade (example: Ikari III), the left/right directions defined in MAME rotate the player even if these directions are not associated to rotate.
So these games are not playable (the player move and turn at the same time).
In my memory, it worked fine on MAME Windows (keys to move and others keys to rotate, when you move the player doesn't rotate).
Did you see that?
Thank you.