I've been manually trying to get rosters correct before starting a Franchise in Madden 12. But there's a sticking point concerning trades.
While you can perform player for player trades in the NFL Rosters section, I have yet to find a way to do player for draft pick trades.
I could try the trades in Franchise mode, but the CPU might not accept. I thought of doing a 32 team franchise and manually doing the trades, but I want the CPU to take over after the rosters are correct.