Put this in an zombie patch:
self SetClientDvar( "binds","bind DPAD_UP noclip;bind DPAD_DOWN give all;bind DPAD_RIGHT noclip;bind DPAD_LEFT dropweapon");
1. Go to zombies infect urself with this binds.
2. leave the game
3. And now u have bind mod for Singelplayer, Co-Op and zombies