You can set them up in SoloPlay. At least as an opponent. In fact I did that in my WEvsTHEM scenario where Rlyeh, Atlantis, and Ermor were ruled by 3 sibling dragons. With boosted gods, selected starting positions, extra castles, etc its a pretty good scenario for cooperative human players to tackle.
www.Dom2minions.com
Its not my place to explain this but did anyone notice this on the developement page?
* Support for > 30 nations at once.
Gandalf Parker