I have to say, this is really a great mod, the best for CKV in my opinion
But I have three major issues.
Firstly, as I often play as one of the Russian principalities, I think you should change a bunch of the Ukrainian provinces. Their names and locations go against local history and geography. Particularly Desht-i-Kipchak; nobody but Persians would have called it that in the game's time period. So I have included a map of Ukraine as I think you should do it. I used Tatar/Kipchak names where applicable (ex. Azak, Bayraq, Duna, Sary-Sin, Kuchurhan), Slavic names (ex. Ulich, Belaya Vezha, 'Ltava), and a few names of Greek or unknown progeny (Alta, Olbia, Asperon).
In addition, the chieftain of Duna should be a vassal of the count of Tmutarakan in the 1066 scenario, to reflect the political circumstance of that time.
Green are provinces slightly redrawn or edited, White are the new provinces, Blue are unnaffected, and the names are provided where different from the original.
Secondly, and I notice this happens a lot, the kingdoms completely disintegrate and fragment or otherwise 'mess up' by the late 1100s. Like Aquitaine or Burgundy or Ireland have vassals all over the place. I'm not sure whether this is your mod or the game in general though.
Thirdly, the Mongols arrive in the wrong place. I've seen them arrive out of nowhere into Ingeri, the province north of Novgorod, which was pretty funny admittably but not exactly realistic
Gives a whole new meaning to the 'Gokturks' (sky-turks) I guess xD
Beyond those three issues, though, it's a great mod. Thanks a ton for making it!
EDIT: I think you'll need an extra province though, if you decide to change it- you can integrate Perekop into Azak
EDIT2: You can call Duna either Duna or Tanais, the first is just the Tatar form while the second is the Russian/Greek form.
EDIT3: Belaya Vezha, Ltava, Ulich, and Alta should be Russian Orthodox, while Duna and Asperon should be greek orthodox. All ruled by Pechenegs/Cumans though.