If the ball is in the air:
Press A : fast pass on a teammate. Hold S: fast header. Hold D: a fast shot on goal.

If the opponent has the ball:
ALT or CTRL and Q: push the opponent away and kick him.

If you take a free kick, a corner or a goalkick:
ALT - Turn the ball to the right
CTRL - Turn the ball to the left

If your team has the ball:
ALT or CTRL and one of the keys: A, S, D, Q, W, E = feints.

Players with big heads:
At the main screen, you press modify, and then modify players. Erase a name and change it into 'eac rocks'.
Then, press enter. A little screen will show. Press the red little ball.

Cheats:
Input these names at the Player Edit screen to alter player name.

Input city - The crowd will exit.
Input dohdohdoh or mrhat - Acquire Crazy ball.
Input eac rocks or gabo - Get Big Head mode.
Input footy or powder - Acquire Silly moves.
Input hurst - Get Classic 1966, 1970, 1974, 1982 matches.
Input johnny atomic or cartman - Dive.
Input kenny - Ball's Ablaze.
Input kyle - Get Skeleton players.
Input neila - Get Alien mode.
Input ur1ofus - Get Invisible walls.
Input xplay or gonzo - Get Hot potato mode.
Input zico - Get Classic 1982 match.