I remember that some guy came in here a few months ago and posted this as well but no one believed him so he stoped posting lol
Now I discovered the codes to get the hidden gamemodes (actually they are just the same gamemodes of the ps360/pc version) in WaWii!
It has ALL of them including War, Capture the flag, Domination, Sabotage and Search and Destroy. (HQ is not working)
Well, as soon as I figure out how to make this codes run in my Wii we can have some games going. Also Im searching for another code that lets 12 people play in the same map, and trust me since today I joined a hacked match with 12 people playing SnD on Asylum

Hey dude I'm going to add you on Call of Duty Modern Warfare kk my friend code is 141750807427