This might be a big ask, but it would be great there was a way to see the rough population size of a city (like how it shows the population for the village generator) and maybe even the population density for the city. For me personally, this would help comprehend how large a city roughly is.

In the Village Generator the population is calculated by multiplying the number of buildings by the "average number of people per building" chosen randomly from 3 to 7. You can see the number of building in MFCG at the top left corner by pressing (and holding) the SPACE key. Average number of people per building in cities varies too much (depending on climate, culture, tech level etc) to suggest any specific values. Choose what suits your setting.