The Jamie Gough answers: (Or attempts to answer)
Q 1. Does anybody think body weight helps a player run through tackles?
JGA 1. It should, like in Madden, but no, I think it is safe to say that in Rugby 2005 it doesn't. If they have 'Tackle Breaking' as a 'Special Ability' then that does, but weight does not.
Q 2. Are some Hookers better than others at throwing in, or is it all down to you?
JGA 2. 'Lineouts' is a stat that the players have in their abilities. Thats a good question, but I would guess that for the AI the lineout stat may make a differance, but if you are playing on the team that is throwing in, then I would again say no.
Q 3. How does the in-game 'Stamina' of a player affect their performance/likihood of injury. Does it really matter if it gets low, and do the players really go downhill enough to warrant a sub?
JGA 3. I don't think it makes differance on the liklihood of an injury, however they do slow down, and the most noticable performance that it impacts on is when you kick for goal, you will notice that if your kicker is rather fatigued his accuracy is worse, you will see that when kicking for goal the area in which you stop the metre at for accuracy is smaller than when he was at 100%.
Jamie Gough