See, I think his running abilities are being overrated. His first six starts, he was averaging 7.1 yards/carry. The last six (regular season), he was around 3.5/carry - and he only had one game (against the Pats) which was >4.1 (and then NE shut down his rushes in the playoffs). He's also fumbled the ball quite a bit. He's good in space, but his fundamentals as an NFL running back are just as bad as his fundamentals as an NFL quarterback - he runs way too upright.
He ought to be playing basically as an H-back/quasi-tight end. He can still get some carries (Aaron Hernandez gets some rushes out of this position, and does very well with them). But, use him as a receiver, get him the ball on some quick slants, get him out in space on some screen passes. Tebow is at his best in the open field, where he's got the quickness to make defensive linemen miss and the strength to shed the tackles of defensive backs. Even a few (small number) of Wildcat-like option plays; I've said for two years, he's the Evolutionary Ronnie Brown (even though I don't think he believes in evolution).
But, I don't see him as a classic, between-the-tackles NFL running back.