Perfect Players: Go to player edit and go to someone from another team. Take all their skills down to 35 and when you are on the + side, go to your team and make any player perfect.
Increase Team Bankroll: Go to the team edit screen and press Square, X, Square, L2, L1. Once entered, you can highlight the money option and change the amount.
Unlimited Player Attributes: At the Player Edit screen, higlight any one of the attributes and press L1, L2, X, Square, X.
Control Ball Physics (PAL Version): At the Team Edit screen, press Square, X, Square, L2, L1.
Harder Kicks: At the Team Selection screen, press R1, L1, DOWN, UP, LEFT.