is there a way to set up buttons so that you are able to use them to change antirollbar setting (not having to press F11 and then use the arrow keys)by writing an extra line in a file for example?
i haven't read the full post, but have you tried applied direct power to the motor? and se what it does,
if that works out fine, try to put FFB on in a game, and check the voltages running to the motor.