Breaking the rules of defensive player lock is ok if you are trailing, as long as you go back to obeying them once youve tied or taken the lead, you will still hav close games. If its late in the game and your under pressure you can break them too, youll still get beat.

The key thing for editing is to make your squad worse. Speed is the best to edit, make thier centres and loose forwards fast and yours a bit slower, this keeps it realistc.