Enter the codes at the Options/Cheat menu, then while playing, pause the game
 and go to the cheats menu to activate them. (The codes are case-sensitive)

 backdoor        All Cheats
 roadtrip        All Levels
 YOHOMIES        All Characters
 Peepshow        All FMVs
 pumpmeup        All stats
 givemesomewood  All decks for the current skater
 magicmissile    All mode options

 Now you have the wanted option cheats in the pause menu.