I would like to see them eliminate coaching except on change overs. I was pretty disappointed this year watching a match with a top ten player on a top ten team and his coach was standing there telling him where he should serve after every point in one game.
Eliminate the medical time out. If you are not in good enough shape to make it through a match without cramping then that is your problem. If you are going to play injured, then that is the chance you take. Unless there is blood involved then there should be no reason to delay the match.