Go to Inside EA. Highlight credits but don't click on it.You can now enter one of the Passwords below while 'credits' is still highlighted to enable the Effect you require.
Effect .... Password
Easily hit 4's and 6's .... sbatsman
Big Bat .... bigbat
Fielders can't catch .... butter
Unlock teams & Stadiums .... unlock all
All cheats above submitted by Joshes