actually dude, its possible... you should try this out
=====================================================
You can always change them in the strategy screens when you play the game. If you whish to change them permanently for a team then you need to edit the teams.dbf file. Change PRIM_OFF and SECON_OFF to the codes you want. The codes correspond to the ID code in the plays.dbf file. Just select the play you want and use its ID code in PRIM_OFF etc to change the offensive strategy. Make sure you don't select a TYPE "D" play cause those are the defensive plays.. silly to do those for an offensive play.
To change your main defensive stategy simply change DPMAIN field in teams.dbf to the ID from plays.dbf of the play you want. This time make sure to select a TYPE "D" play. Selecting the wrong type will cause the game to crash..
=====================================================
THANKS TO DAVID FOR THIS.....