now ive been doing alot of research into this and ive found out a few things.
i have a list of commands here, some of these can be applied but i havent tested them all.
//NOTE You must be host in order for these to be applied

setperk GAMERTAG HERE specialty_additionalprimaryweapon //Mule Kick
setperk GAMERTAG HERE specialty_fastreload //Speed Cola(Sleight of Hand)
setperk GAMERTAG HERE specialty_quickrevive //Quick Revive
setperk GAMERTAG HERE specialty_rof //Double Tap

i did find one that said "specialty_armorvest" and i thought that would be jugg but its not.
you can also sign out of your offline account mid game and change the gamertage to someone else's in your game.
although from what i have read you can have a clan tag on but i havent confirmed that theory.
also i read that if you or your buddy has a space you have to change it...

A one worded gamertag

bind DPAD_UP "setperk zombiehacker specialty_rof"

A space in a gamertag

bind DPAD_UP "setperk \"zombie hacker\" specialty_rof"

have fun if anyone knows anymore please post