Ah I see now. I suppose I am hoping that modding city-states is easy, Its really only a name, a logo, and 2 describers (i think). Because as it is, and I thank you and your map makin skeels for pointing this out, I feel there are WAY to many European ones. Here is a lil bit of how I would add or subtract.
-Id get rid of 22,25 and add in Jerusalem, cuz who honestly doesn't want to fight over that.
-Id get rid of: Almaty, Belgrade, Bucharest, Copenhagen, Edinburgh, Geneva, Genoa, Helsinki, Lhasa, Oslo, Ragusa,Sidon, Tyre, Venice, Vienna, Warsaw. Seriously most of these places just overcrowd Europe even MORE then the civs do and are not really cool places to deal with.
-Id add:Jerusalem, another Native American tribe or 2 one in the west one in central, for south america maybe Lima on the west, keep rio on the east and put in Buenos Aires at the southern tip. Over to Africa i would keep cape town, add madagascar, put Marrakech up at the north west tips inland of course, something on east africa like Djibouti (gotta love the name), probably toss in a mongolian city or something as well as kazakhstan for horsehockyz and giggles. Definitely would give the Ausies some love and mebe even New zealand.
I just feel like spreading them out over the entire map would add A LOT more then having them bunched up the way they are as of now.
Imagine starting as a Euro civ and having to compete in every way with all the other Euro civs while having to spend money to please countless city-states? Or the opposite, how easy it would be to play iroquois or US on the other side of the world and not have ANY to deal with and you can spend your gold and time how you please? I call that a serious imbalance IF they are all placed as they are now. Having them spread over a nice area where each civ is close to a couple/a few but not overwhelmed will help balance the world map just a bit.
Thats all just my opinion i could be way off.