A lot of those civilizations aren't currently included in any scenarios. Only 17 are included in the main scenario. The rest are for scenario makers. Speaking of scenarios, Craig_Sutter, do you plan on updating The Viking Age?
I haven't played this mod with random maps... are you saying that almost any of the above civs may come out in a randomly generated game. I had always thought that a particular 18 were available, and the others needed to be placed in scenarios. Or are the others merely selectable opponents if the person playing the map wishes to choose them in a random map game?
I'll have to start up a few generated games and see how that works.