I think having over-9-capped cities in wildlands is a GREAT idea!!! It would make the wildlands worthwhile to conquer, and (IMO) be okay with balancing issues.
This is just my opinion too, sorry if I didn't quote everyone who mentioned it.
I'd even go as far as enforce 9+ tiles in captured wildlands.
As for the actual topic, I actually can't see the reason why this should be fixed for every mod you play. I understand the reason for capping it for balancing the stock game, but that doesn't justify locking it for mods.
