Geez, don't go over the top. Why don't we just get rid of ball kids? That way the ball will get too flat by the 2nd half and they will be less inclined to take a shot at goal.
Alternatively, we can try my "left field" idea. It's pretty abstract, but hear me out:
(1) Limit the amount of times a team can carry the ball into a tackle to 6.
(2) Get rid of the ruck, and instead - each time a player is tackled he is guaranteed to keep possession, and is allowed to get up to play the ball to a team mate.
(3) Take away 2 players from each team to ensure more tries.
(4) Change the scoring so a try is worth 4, goals worth 2. And make drop goals worth 1.
(4) To ensure better attacking rugby, make the offside line at each tackle 10m back.
(5) Take away the scrum contest to ensure more time for rugby in general play.
(6) Another way to save time will be to get rid of the line out, lets just give the throwing team a tap on the 15m line, or some other outrageous idea.
I feel my idea will limit the number of penalty goals taken and bring us in line with standards set by some of our competitor sports.