into your game, you are host so it would make sense and be fair to enable co-host for your friends, unless your planning on torturing them lol, so they can use the menus as well. I often used to host modded matches for people using GSC Injector, I have over 100 GSC menu's that can be used with it and 50+SPRX menu's just for BO2 MP and Zombies (some menus can be more than one GSC file depending on whats being altered, The largest I have is Predator v6, which I think is 4 to 6 GSC files) This is not counting other menus for other Call of Duty games and game modes. One of the best menu's out is Black Genysis by Kiwi for MW3, trying to get the one for BO2 but can't find it anywhere at the min. Also Paradox v2 is an awesome menu as well.

Reincarnation is one of the best for Zombies on BO2 and one of my all time fav GSC menus is Bossam v6. There are also many game type variants out there to mix it up instead of the boring standard game types - zombieland, the hunger games, hide and seek, the floor is larva, crossbows and knives, mike mires, cranked and many others. I take it you have multiple users on your PS3? This should make no difference at all.

I have never had this problem on Black Ops 2 with any Tool I have used and I have 3 active PSN users and accounts on the PS3 I use for modding and its never mattered which user is logged in.The most advanced USB mods you have ever seen.

Bo2 gsc studio zombies