Sorry, but I'm with KTown on this - you cannot build a successful offense around someone who dances around at the line of scrimmage like Reggie does. Someone mentioned that it's like Barry Sanders, and it is. Barry led the league consistently in negative yardage runs, and he put his team in a hole every time he did it - and it's the same with Reggie. At the end of games, Barry would have 20 carries for 120 yards, with two of them for 100 yards and the other 18 for 20 yards. And the Lions defense would be on the field for 40 minutes because their offense would either be 3 and out, or big play Barry would score in 30 seconds.
While Reggie doesn't dance quite as bad as Barry did, he's also not as explosive either. The fact is when we give the ball to Reggie on first down, there's probably a better than 50% chance we'll be looking at 2nd and 10. That's not a formula for a success.
I'm all for getting him into space and giving him touches that way, but until he can pound out at least 3-4 yards consistently between the tackles with no negative yards, we shouldn't be giving him more carries.