Stephen Hunt was on soccer am this morning talking about his Irish teammates, you can see the full segment here: http://www.skysports.com/socceram/me...305175,00.html
According to him, McShane is the best trainer, which would go someway towards explaining why he's constantly selected in squads. Trapattoni sees what he is capable of on the training pitch, and hopes think he can reproduce it in a game.
Incidentally, this is why I think Gibson is selected in squads too, he's supposed to be excellent in training, which shows what he is capable of