Plutonium

Only issue is that's a BO2 menu and I can't find any good menus for MW3

Wanted to have 2 instances of MW3 open so that i could use one as a dummy to go for slide trickshots on. Tried opening the launcher through Sandboxie and launching MW3 through there and it just crashed unless i opened the game in LAN mode, which did let me run 2 at once but i obviously couldnt play online. the same thing happened when i just tried to open 2 instances of the launcher normally. is there any way to do this?