This is one I've thought about for a while. Not sure if its been mooted elsewhere or not. How about a captains call for any knock/ball steal situation? Always annoys when the ball gets pulled out in the tackle and the ref calls a knock on, but the replay shows a clear ball steal. The captain can have a brief word with his player and decide wether to appeal the decision. In which case the video referee looks at it. I'd give three appeals per team, per game. I don't think it would slow the game as I'm sure players would stop doing it once they can no longer get away with it. What's people's thoughts on this? Any other rules anyone would like to see used?