If you REALLY want overkill, then you can buy Kewin Track Pedals which have a lever that locks and unlocks the cleat.

http://www.keywin.com/track.html

The website states: "NOT FOR USE FOR NORMAL ROAD RIDING"

But, I'm sure that will have you guys lined up to buy them. One has to reach down and flip a lever that unlocks the cleat. This effectively eliminates the #1 benefit of clipless pedals, though. Clipless pedals became popular over toe-clip pedals because the riders didn't have to do that at every stop light. Just twist the foot.



A review: http://www.whitegaragedoor.net/blog/?p=6