I have a friend who uses the double straps, on track pedals with spikeless track shoes. Bug-time track-stander, no helmet ever, Mr. Cool I'm SkilledLookAtMe. And yes, I was impressed.
Until his L pedal worked its way out. 17 staples in the back of his head, courtesy of a curb and not being able to free himself, and no skid lid.
Another reason I'll have Campy pedals at Brazen Dropouts swap meet.