If you are really competitive (and kev is ;) you can actually use pedal strike to turn faster... It would be against the rules (at least you should tap out for it), but no-one's ever told me to tap when I've done it. You use the pedal like a pivot point, it's quiet easy if you do it fast enough.
If the pedal contacts but your foot doesn't, I don't think that's a tap out.
If the pedal contacts but your foot doesn't, I don't think that's a tap out.