To keep you gents from speculating excessively, remember I'm a tactical guy, and my F-4 could be steered with the spoilers fairly well, which was useful when putting out the drag chute on a slippery runway. (talk about weather cocking)
I'm assuming that the MD-80 series has more than just ailerons for roll control, and the additional surfaces could be used for steering if not being used for slowing down the aircraft. Now if I've made a bad assumption, I'll make these posts of mine go away.
