I dont know if big ant read this thread, but here is an idea to possibly fix the ruck. How about when a ruck is formed a random button combo is generated allow players to join the ruck. For example, ball goes to ground, first player selectable press x, once x pressed circle flashes up, press circle then triangle and so on. This would mean that a players reflexs were what gained an advantage and it would force players to practice and as it would be randomly generated there are a number of different variations that could happen.
Same with scrums. Would it not be simple to have a bar which moved from side to side generating a random area to stop in so again it would rely on a players reflexs meaning those who practice would be good.
Just a suggestion.