There has been a lot of debate in in Northern Hemisphere RU (generally play the more conservative Rugby) and Southern Hemisphere Rugby Union (generally play more expansive, flowing football) about the high incidence and arbitrary awarding of scrum penalties at the 2011 World Cup and in other international and domestic tournaments. One major factor is argued to be the hit/collision when front rows engage: the referees protocol (introduced only a couple of years ago to prevent scrum collapses) of crouch, touch, pause, engage did not remove the explosiveness of the hit, and is executed at different speeds by different referees.
Anyway, 3 former England RU props collaborated with the IRB Chief Medical Officer to submit a proposal to the IRB to reform scrums. The article cites the astute technical analysis on the physics of the scrum conducted in the paper. Anyway, the main features are:
* "Crouch, touch, pause, engage" be replaced by "Stand, touch, engage, push". To remove the "hit", potentially, reduce neck and back injuries and arthritis. (However, another former test prop feared removing the hit could decrease hooking)
* Change 13 scrum laws.
* Introduce an Unconvertible Penalty Kick to decrease the number of scrum penalties, and remove penalty kicks from scrums). Presumably where a player can kick for touch, but not go for goal. Similar to their free kick/short arm penalty, or a differential penalty in RL. The NRL All Stars trial of a differential penalty/restart of tackle count seems the best (SHRU trialled a similar Experimental Law Variation in the short arm penalty in 2007 Super 14, but the NH 6 Nations refused to trial it, and vetoed it at the IRB).
That proposal is relevant to RL in that RL could reintroduce competitive scrummaging, minus the hit, to introduce a contest for physical dominance (if not necessarily for possession) that could have a positive flow-on effect on the game, by increasing the variability between positions (in size and body type) and in positional play.