Thunderbrd
C2C War Dog
Yes, and it's done already on a national level but would be very difficult to integrate it in for the city level alone. Is it REALLY needed? Culture thresholds for any added culture levels beyond the cap we're at would need to pick up a Greater Culture tag to express what they require, because even expressing too high a number in the XML would not work. Then that amount won't be quite so granular to adjust to scaling effects with much accuracy. Not saying it can't be done, just that it's mathematically fiddly and wouldn't be quite as smooth as one might hope.Is it possible to make something like Greater Gold but for culture?
Even with 4 slower speed you will eventually get 21 million culture in city and then city stops providing culture for national culture.