Is it possible to create a "mod menu" for WaW campaign? (let alone including other COD campaign modes in plutonium)

[UserMCBG]

When I say "mod menu", a menu similar to a typical Zombies / Multiplayer menu (e.g. god mode, infinite ammo, no clip, get different weapons, view in third person, so on. Obviously there's no "host" since it's considered offline and it's not a part of an actual server) I've never seen this feat done before and I could only imagine it would be difficult to pull off, but I strongly believe there is a way to include a "mod menu" inside the campaign. Regardless if it is or isn't possible to do, give me a detailed explanation involving the programming of the files and file names to give a specified insight so I can learn and study.