We are using version 1.12-2.0.22 (yes I know, still 1.12 so most people don't support but I also know a lot of modded servers are still on 1.12.2 so.... hopefully someone will have an answer.

We are wanting to have the generation of cities more spaced out and have the individual cities be random from the different types.

You can reduce cityChance to make them more rare. You can't really do the different types though except if you do it like deserts with a different style dependend on biomes