They can be "faked" in some ways using mods, mid-game switched mods, admin-run nations in the game, etc.
If you love randoms (like I do) have you checked out the Chaos games? Or the SemiRand games? Both include AIs so you can join one and play by yourself if you want (or get others to join and play)
http://www.dom3minions.com/HostedGames.htm
Gandalf Parker