R U kidding me?
Civ4 - Rhye's and Fall of Civilization | CivFanatics Forums
I've definitely mentioned it previously as well, when speaking about "making a Real World scenario".
It has "core areas" for nations on the map, which could be easily translated into Cultures needing not resources, but literal geographic spots.
Again, you might simply not WANT it, so that's that - and I understand it.
But to me, it'd be a great implementation of Cultures being represented by geography itself.
It would certainly feel more "realistic" to be able to gain Cultures by territorial conquest, as opposed to random resource hoarding.
Better yet, if it was made dependent on having a city in that Culture's "core area" - which is more or less how Real Life Cultures work in the first place.
And/or you could make Settlers carry more than just Major Culture Groups with them, but actually Minor Cultures as well.
That's how actual migration works to begin with - and it'd be a great point towards "immersion" in regards to Cultures.
Oh, and I do realize that all of that would ONLY work on a pre-made Earth map - but we have a great one already, and it could be a mod-mod in the first place.
But, again, if you are NOT interested in any of it - it's YOUR mod, so that's that.
Sorry, I'm just getting overly exited over such stuff, lol.