40m tap does change things for the better. Kickers would have to be a bit more careful despite the pressure of the defenders trying to charge down or sack.
Speaking of charge down, the new rule in regards to no re-count for charge downs is a good one IMO. If you fail to clear the ball because the opposition hustled hard to charge down your kick, you shouldnt be rewarded another set of 6 for your failure (given that you managed to regather the ball back after the charge down). Its a similar big play to that of Grid Iron when the quarter back gets sacked.
Not many backline set pieces of the scrum end up in a try but there are times that it does happen. Leaving the 13 out will most probably stamp out any more tries coming of the scrum. Its an interesting rule.