"...where you make desicions on the day to gay workings of your club..." Dr. Fantomas Jr.
That just sounds wrong - what kind of rugby game do you want!??? 
Kage,
Good point - I see where you are heading. Rugby 2k5 did this quite a lot - like with AI side-stepping your defender and stuff and it being pre-determined i.e. no matter how good you are it is not able to be stopped.
My idea was more along the idea that you would have to work on either your attacking or defending game to build it up. For example if you miss a few tackles and your players on the back foot it is harder to defend. But if you do make some good tackles and get your guys back in formation, maybe slow the ball a bit , then your shield will go back up.
I think that this would reflect rugby a bit more realistically.
guardian_of_the_stone_age,
Good points - this is not how I would design my passing. I would like to see a system where you press the button once for a short pass, twice for a cut-out pass, and three times for a long, long pass. Very same same as had been suggested before but with a slight twist.
If you hold the button down the receiver will run up into the line so you can use it to break the line. Time it wrong and the defender will get smashed or the receiver will overrun the pass. This would work for all of the different types of passes.
ak47 gets it right though - just a few improvements would improve the game hugely.
For me the biggest improvement would be the ability to easily modify the stats of exisitng players.