Many will know my liking for the Mitre 10 games from NZ - really enjoyed the games last season and part of that was the ethos of the games, facilitated by refereeing that made the game faster...and seemed to avoid some of the problems caused by having time to get everyone into defensive position
Firstly, the tackle laws were enforced so that arms needed to be used, tackle called early, tackler had to roll and tackled player couldn't wriggle. Ruck called as soon as possible, so no hands unless really quick and the ball is away v quickly indeed. Now obviously, not always - but it seemed to make for a quicker game - which rewards quicker players. Refs called use it v quickly and enforced it.
Penalties were quickly awarded for hands in rucks, etc, scrums done quickly and not reset if the ball playable, emphasis on getting the ball out unless 5m and push over possible. This led to fewer scrum penalties and less time lost.