I like this sort of discussion...
How about on top of the current tactics options, ruck strategy and defensive strategy, you include anther "ruck agression" strategy.
Ruck agression would consist of the following 3 options:
1. Balanced (default option)
This option works as currently setup in the RWC2011 game, where the team will automatically send the default 3 players and 3 players only into a ruck. What 3 players (either forwards, nearest man or balanced) enter the ruck is still determined by the ruck strategy options provided and you still have the ruck intensity meter to contest over.
2. Hold Back
This options holds your players back from the ruck, not contesting possesion, but keeping your players in the defensive line. This option will bring 2 players to stand defence immediately either side of the ruck (1 on each side) to tackle pick&gos or sniping runs from the scrumhalf. The rest of the players fill out the defensive line.
3. Pile In
This option continues to bring extra players (above the default 3) to the ruck until possesion is locked in or won on the intensity meter. Again this option works in tandem with existing ruck strategy options, so you could end up with alot of backs in the breakdown area depending on the option you've selected.
By adding more players and based off the cumulative rucking attributes of the players in the ruck, this would impact on how much intensity was required to win a ruck. Typically, more players = higher rucking value = lower intensity required/less chance of giving away penalties.
However, depending on how you use the ruck strategy options, you could end up with 5 backs in a ruck (having chosen nearest man and the ball was spun wide in the previous phase) up against 3 forwards (the defensive team sticking to the forward only rucking strategy and default for our new rucking aggression). In this instance, the 3 forwards would have a greater combined rucking value so less intensity would be required to win against the poorer rucking ability, but greater number, backs.
This would hopefully negate the previous issue of a team always adding the most players would win the ruck.
Now I'm not sure on the controls for RWC2011 and its strategies, so I may overlap in terms of button combinations with what is currently in place.
Basically what I would envisage would be a menu option based off the current FIFA11 model, where selecting UP on the d-pad brings up a quick sub-menu that lists 4 options (each associated with a direction on the d-pad).
The rucking agression options would be selected for example by pushing UP once to bring up the 3 options available, then pushing in 1 of 3 directions to choose your option.
Not perfect by any means but something to think about perhaps?