Um, most of the reverse camber skis are twins, Spats, ARG, Lotus...and with the reverse camber, the tail height is actually greater than a traditional twin.  The pontoon is a twin, though I can see problems trying to land backwards on a ski with that much taper, but it would throw a sweet roster tail.
Oh, and to "reverse camber is reverse sidecut" nope reverse sidecut is reverse side cut.  I think it is actually the bigger advancement.  NO hooking, it's incredible, go as fast as you want and stay in perfect control.  I'd love to try the newere designs (my spats are going strong) purely for the on-piste performance.  I'm sure the advancements have made powder riding better, but I'm pretty happy on the spats in the smooth stuff.