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Also regarding Romans, I don't understand why they have to only represent Western Roman empire instead of the entire Roman empire. I think Roman stability maps, settler maps, continent/war maps and production bonuses should be adjusted (and maybe even add more scripted events for help AI Romans) so that they are in a better condition to replicate the real Roman empire. In most games I don't see Romans obtaining any cities in Egypt, Asia Minor, or the Levant. And their UHV should be adjusted so that their game doesn't involve them to try and unrealistically defend the Western Roman empire for 500 years longer than it actually existed, but instead to have a goal that makes them more focused on the east from 500-1500AD that way they would come to represent the Byzantines more. Byzantine language may have been Greek, but they are still politically a continuation of the very Roman Empire itself.
I agree for the 600AD start the Byzantines should be its own civ. But for the 3000BC start could the Romans be adjusted so that they would represent the actual Roman empire (including its eastern conquests which by 100AD is already becoming the backbone of the empire's economy) and then through scripted events and other changes evolve to represent the Byzantines (aka, switch palace to Constantinople, spawn some units in east so Roman AI wouldn't be screwed if barbarians take over west which they can be made to most certainly do take over the west)?
PS: Has anything been done to strengthen Mumbai? Traditionally its considered India's strongest city and Delhi is considered India's "second city", yet I think Delhi's location is far, far superior to Mumbai's. I guess cities that I like but are of less concern to gameplay/might not have an easy solution to remedy are Alexandria, Damascus, Venice, New York and Los Angeles.
I can't remember who mentioned Baghdad not being a sufficiently prominent city, but I agree that Baghdad should be already founded in the 600AD start. If AI Arab controls Baghdad by 762 AD, a scripted event could switch their palace from Mecca to Baghdad (or to their largest city so it could be a tossup between Baghdad and Cairo). This capital switch would make the Arabs more aggressive in conflict with Turks and Byzantines and also make them more vulnerable to collapse in the case their more offensive capital is conquered. This makes sense historically too because Mecca was never really that prominent of a major city. Mecca is also too resource rich to be geographically accurate. A scripted capital change idea could also worked well for AI players controlling China so that its capital in 3000BC doesn't necessarily have to be Beijing. I feel like more scripted events in general could be made especially to help AIs make what would otherwise be intuitive decisions for human players, eg a scripted fort could be made if an AI player control the region around the Suez canal.
Having Baghdad as the Arab capital would also make for an interesting idea for a possible change to the Mongol's UHV

. Conquer the capital city of 6 separate civilizations, easiest ones would prolly end up being Beijing, Moscow, Baghdad, Delhi, Tokyo, Wien. This UHV would get the Mongols in conflict with many of the civs they were historically in conflict in, plus I think it might be a fun UHV.
PPS: RFC DoC has officially become my most played mod this week
Also some other things (most of which you prolly already heard of):
-More events, especially a Crusades event
-More random events, (i still like the bandits idea that spawn as barbs in your territory when stability is bad)
-An opportunity to control stability in the short term other than golden ages. ie: if stability is bad, one city declares its independence, representing a rebellion. If you can reconquer that city within x number of turns, you get a good stability boost.
-Have all cities that declare their independence get their own units, and your units would just move outside of their newly created borders.
-More variety in North American barbarian spawns. Is there some way of reworking graphics for Amerindian civ units (since Aztecs and Inca don't get iron, yet they have some pretty cool graphics for swordsman, spearman, but not longbowman and pikemen etc)
-Buff Arab start, but nerf their later game modifiers
-Buff Turk start (so at least they'd be able to in half the games overtake Arabs as the predominate Islamic power).
-More independent cities representing Islamic southern Spain and Northwestern Africa, also one representing Scotland. Would be nicer if cities were scripted to be razed when conquered by human players to avoid extra city advantage and lack of city placement options.
Great job with the mod. And as usual, ignore suggestions as you see fit