I've already been silenced by my family with all my ideas for rule changes that would improve games, such as having an over and back rule in soccer like in basketball.
But I DID come up with 3-on-3 for overtime before the NHL did. Actually my idea was 5 minutes of 4-on-4, followed by 5 minutes of 3-on-3, followed by 5 minutes of 2-on-2, then 5 minutes of just the goalies. Don't know about you but I would NEVER leave a game early if that was the rule.