When on defense against a field goal or extra point, take control of your fastest player. In most cases, this will be the player all the way on the right.
Line him up between the long snapper and the guard to his right, but just a hair above where they are standing. In Madden 94, the line of scrimmage is not the ball, but the feet of whoever is snapping the ball. This is how you'll be able to line a man up so close to the offensive line in the first place.
When the ball is snapped, you'll easily be able to shoot your man through the line and block the kick thanks to this lovely little glitch.
When the computer is forced to punt, take your fastest player and line him up on the left side of the field, just outside the leftmost offensive lineman. When the ball is snapped, you'll easily be able to use your superior speed to charge in and block the punt due to the running back in the punt formation never moving over to assist in the blocking scheme.
Select a playoff game, then press START. If you do this on every game up to the Super Bowl, you can skip right through the playoffs.