I kinda like how the existing dirt decals deal with the transition at the edge. Less straight makes it look more natural imo: Apart from that, the pebbles and the grass are nice. Maybe make the grass a little lighter, so it doesn't stand out too much and it fits with the colors of a mediterranean biome.

yes, I think that's the one I have some of these functionalities are really useful for a fast and clean uv-mapping

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.