I like this game, but I've noticed the co-op mode is only available in online multiplayer, which is a shame.
However, I've noticed this thread: http://forums.mode7games.com/viewtopic.php?t=6702
in which someone mentions that there's a version (a mod, perhaps?) allowing for offline co-op. The thread is, however, very old and there's no information on where to get such a mod.

So, does anyone know of anything like this?