yeah. Those are the values from old RFC. For some bizarre reason the developers of RFGW who came before me left it in, along with a bunch of stuff related to the old civs. I think I will try to comment it out, though I expect bugs to ensue, since RFGW's developers had those for a reason.
Re pirates and barbarians: There should already be swordsmen pillaging the Hittites (who collapse anyways), so they don't need more barb pressure. I did however add a pirate unit, which is like the privateer, and can be built by civs for use against each other.
Re Huns: The huns are suppose to go around and raze stuff in that region, which they do. They should have UHVs to give a unique experience to the player, and a scare to the major powers when they are AI. UHVs are the only way to make them winnable. I plan to make their horse archers strength 9 (stronger than the Legion unit which civs have by that time), so that they do a lot of damage.
Re Migration Period: That's what the Germanics should be, and eventually the Vandals to make North Africa more interesting.
Re Bosporan Kingdom: First, Athens actually got there in your game?! I've never seen the Athenians go that far, though they are very powerful. Second, in the latest posted version, that region of the map is broken: the black sea has no Crimean peninsula. I fixed this by now, and if you want, I can post the current patch once I fix some introduced bugs (though if so, then the Byzis will not be replaced).
. One possible explanation is that plains in this mod represent https://php.radford.edu/~swoodwar/biomes/?page_id=98 Medeteranian shrubland. I will have to take a closer look at where these tiles appear to give a better answer, though I agree that the current tile yields are unbalanced
