The main scenario is the map that comes with the mod. There are 16-18 civs on that map. These are also the civilizations that will be accessable in a random game using the mod. The XML file governing civilizations allows up to 18 civs to comprise the main body of a mod, and be accessable via random map generation. These mod civs will play out on any mod generated map. The map that comes with the mod incorporates these (at the moment 16) civs within it.
Additionally, the XML file also allows any number of civs to be appended to it. While these will not occur in generated random maps, they can be added to scenarios and will incorporate the mod features.
To be clear, then, there are 16 civs, at the moment, that will occur on randomly generated maps... these are listed on the first page, I believe (checked, they aren't). A map that invokes these civs is included with the mod. Additionally, there will be other civs included that will use mod features, but will not be on randomly generated maps, and are not included on the scenario map included with the mod.
In light of your misunderstanding of the above (correct me if I'm wrong), then your criticism of some of the civs included in the mod does not make sense. This is not to imply that some of your comments are not without merit, just that they are not being done in the proper context, so don't make sense as valid criticisms. They do make perfect sense if you think every civ Head Serf listed in his post a page back will be in the main scenario, but that is not the case.
Have you played the map that comes with the mod? Or a random map? That makes it readily apparent which civs have made the cut to the main map. And hints as to the basis upon which they've been selected. If you have comments about those civs, and wish some to be added, or to be changed or deleted, they are welcome. Other people have done likewise (the addition of Lithuania and Armenia are cases in point). You seem to have some knowledge of history, and your input will be valued, but you have to give it with full knowledge of the facts at hand, and the mechanics of the mod. This mod hasn't been so far developed that there is a clear and ready FAQ about it, so I can see some of the misunderstanding of how it works. I hope the information I've given is helpful.