I actually think both the NFL and NCAA should modify their clock rules on first down. Clock runs except for last 2 minutes of each half, where it stops on first downs until put in play by refs. OUt of bounds clock stoppage remains the same.
OF course that doesn't really have anything to do with actual game play. I prefer the college game myself. I'll watch my NFL team, but I can watch just about any major college football game and enjoy it.