I don't think it needs to be made an official rule, but the officials should be counseled to not call ticky tacky penalties, especially away from the play. And no borderline holding/contact/PI penalties, only the obvious kind. And less time reviewing plays. At home, we can usually tell after 10 seconds which way the call should be. How annoying is it to have to wait for the referee to watch the same replay for 3 minutes. Have a small team upstairs review the plays and just buzz the call down to the ref so he doesn't have to jog all the way to the sideline then all the way back to the center of the field to tell everyone the call. Referees should not be able have as much impact on the game as they do. One, it's usually not fair. And 2, watching the game is a much better experience when there is less referee involvement. Teams play more physical and the flow is 5x better. Less is more when it comes to officiating. It's really that simple.