As a mouse driver, I display the wheel and driver. I don't get the feedback from the fb, or even the actual angle at which I'm turning, so displaying this gives me an idea of the angle of the wheels. You'd be surprised how different it is to drive with the mouse.
That said, I'm not totally sure this is useful. As mrodgers said, you most people wouldn't use it. I, for one, wouldn't mind seeing the driving shift, but I'd rather see other kind of changes made before this; it's not really needed to reach the point of the game, which is realism driving.