[llamabeast]

The easier thing to do is to create the game in the same way as a normal multiplayer game, but before you do so click "Create a new game" and then cancel back out of it. Doing that loads the mods into memory so it will look for the pretenders in multiplayer mode.

Incidentally there's no way of doing the equivalent thing in text-only mode which makes automated starting of games with mod nations impossible, something I am desperately hoping will one day be fixed. At the moment it's a major limitation on the LlamaServer.