Select Hidden Teams:
On the Start Screen, press Left, Up, B, Up, Down, Up, Right, C
On the Team Match-up Screen, rotate your joystick in a clockwise 360 motion until the game begins. You will now have the Whirlwind Option for the entire game. (The trick does not work in tournament mode.)
On the Team Match-up Screen, hit up-down-up-down-up... until tip-off. You will be able to dunk from at least half court. This works only in non-season/tournament games.
Thanks to Revolution Readers Scott D. Cohen and Jason Beeman!!