While it is, they will only get experience for one position and when a player is listed as 1 position, he plays better there (if he is listed as a QB and is playing QB, he plays better than if he is a DT and plays QB) and only by consistantly playing someone in one position, can you hope for him to change to that position.

hope this helps

I believe so. But he's going to be so worn out I fail to see the benefits. It will say "illegal formation" if you're trying a no no.

Yeah, unless you have absolutely nobody else on your team that would play the position(s) you've got in mind then you can double or even triple up on positions. Very unadvised though. Although in real life guys who can play lots of positions are of great value, on here you really want one guy, one position.