Anything that keeps Al Riveron out of the process is good for the game.
1. Keep it inside the stadium
2. Final decisions from the on-field referee
3. 60 seconds to look at video, however you choose, fast, slo-mo, whatever
4. Any play being reviewed is subject to other infractions that may be uncovered
5. Coaches get 2 challenges per half no matter what
6. No booth review inside 2 minutes. If you have 1 of your 2 left, use it
7. All games MUST have the same number of available camera angles for replay (i.e. Superbowl has like 50 cameras while Bills games typically have about 3)
That is my proposal.