Unfortunately it cannot be done for each team and that is something the NEEDS to be fixed for next year. I hate playing the 'Skins and seeing two scrubs return kicks and punts when they spent real coin on getting Chad Morton. The same goes for almost every team. The default rosters did a pretty good job, but once a franchise starts and the CPU plays with the depth charts, the KR and
PR get all fouled up. I love this game but that is an aspect of the game that should not have been overlooked.
I suggest the same interface that Madden uses. In Madden you are able to set the depth chart for each team, the KR,
PR, 3rd down RB, etc and save that as the roster file.