From replies elsewhere on this forum the word is that it won't break the game to change these. However, to change them all, for all players (or at least 1st class players), would be one hell of a lot of editing! You would probably have to do them all, rather than a slect few, otherwise this select few would be supermen in comparision to other players in their position. Also, unless you plan on playing forwards as backs, or backs as forwards, I reckon that boosting these attributes is probably not necessary. The fwd attributes for backs, and backs for forwards, are really just relative to each other i.e. whether a centre is more powerful or good at rucking, for example, than your average centre is really determined by comparison of the fwd attribute levels of the centres, not those of centres against flankers etc. In a perfect world editing all those attributes to be more in line with reality would be great, but that is a big edit, like I said. Still, if you do it, please post up your edit!!