hey badger, I was wrong, this does work in 2003 as well
type in varlist to view all the possible commands, it will take a second to load
you just type in the command and it will change things
like r_ball 0 makes the ball disappear
r_radb 1.0 r_radg 1.0 r_radr 1.0
these control the coloring on the players. decreasing them all to .5 makes the player lighting darker and 2 makes them brighter, or you can only increase the "b"lue one to make the players blue
quit makes the game exit
there is just a lot of fun little stuff in there, enjoy.