For Tachara and Hall or Tachara only ?

I believe I can pull up what kind of temperate the random map is somewhere although I haven't tried yet. Having different unique vassal civs for different map types I believe is totally doable, and would be an awesome way to show off smaller civs/tribes in those regions. Technically anything can be edited even the match setup UI, but with the scale of the mod, in order to keep it compatible with other mods, having unique vassals spawn per map temperate type automatically would be the way I would go around doing it.   Also just a quick update on the internal version, I have added true random placement of vassals on maps now, avoiding water and clearing trees on their spawn areas.   

I'm going to download this extension and refactor the UV mapping this structure.

Is this: https://blender-addons.org/textools-addon/ ? I didn't know.

This idea is very interesting; I can imagine it as an opportunity to introduce smaller "civs" who wouldn't have a chance in the main game or in a mod interacting with the main game.I can imagine other kingdoms on the Italian peninsula, or even peoples from the Nubian region, etc.This raises a question: is there a way to do this when creating a new random map, Selecting which type of vassal tribe will be present on this map will determine which units or bonuses will be available.  (Select this not at the player, but at the map creator)