Cultural Diffusion

Is it possible to limit the expansion of CityStates?

In my current game BNW+mods on Giant Earth Map the CS Riga and Kiew control a huge territory from baltic sea to black sea with radius 3-5 tiles around the CS.

It would be nice to restrict CS to 2 or 3 rings. (Imho) No need to give them the full distance of 5 tiles.
 
I have a question about the policies option, you said to leave it off for things like NIGHTS but would it be fine with the Community Patch Project? And what policies affect the rate of tile flipping?
 
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