Does the Launcher have launch arguments?
Does the Plutonium launcher have launch arguments to make it possible to go directly into World at War? So instead of the launcher opening and then having to select WaW Zombies it will just launch directly into it?
@MazikeenX only thing I can tell you is that it's using the exe files in %localappdata%\Plutonium\bin with the exes in %localappdata%\Plutonium\games as an argument. Don't know how it works exactly or if it has other arguments but maybe this will help you.
If you're using a game launcher like GOG Galaxy then you could either launch plutonium.exe instead of the game directly or create a macro that starts the launcher and click on Play or wait for an answer from staff.