100 rated players
To create a 100 rated RB, set the upper and lower body strength low enough to put all the other stats at 100. Then, fill up the rest on your upper or lower body strength. The same can be done for a QB, TE, WR, DB, LB, DT, DE. However, for the LB, DT, DE, make sure they are big. For a DT or DE set the weight to 400 lbs. and height about 6' 0". For the LB, set the weight at about 260 lbs. and make him 6' 4".
Better defense
Create two players with a height of 7'0", weight 220 lbs., and stats at 30 for upper and lower body. Set everything else to 100 except jumping and block. Thrown ball should be 95 and intelligence 50.
Unlimited cap limit in franchise mode
Pause game play in franchise mode then hold L1 + R1 and press Left(2), Right(2), Triangle, Square, Up(4), Down, Circle(2). A message will confirm correct code entry.