Isn't Culturally linked starting locations generally Starting Bias, which I believe you can check in Advanced Set up?
Not sure, never played with starting bias on. Can anyone confirm this? I assumed starting bias gave an advantage in terms of location regarding resources and such. What makes you believe it lumps civs of similar cultures' together, i.e. Korea near China and Japan, or France near England and Germany. I think it was in Civ III when each civ had their own cultural identity, European, Middle Eastern, East Asian, and African in the XML... think their was at least one more, it's been some years since III.