I have found that I can move players around from their usual position without suffering any penalty. In other words I will move a winger into a centre or first-five/fly-half position and not notice any decrease in the player's skill even if this new position is not listed as a secondary position. Having played football management games whenever you do this there will always be a lowering of the player's effectiveness. In real-life football players are able to move positions without too many problems but in rugby it will take a while for a player to get used to it as the skill-set is completely different. This means that I can just stack my inside backs with really fast players that have reasonable passing and tackling statistics and I can break any defence easily. It is pretty slack really and it wouldn't even be that hard to include. Opps that's right EA designed this game and they suck.