You know ... I really think that shipping food from a Farm in City X all the way back to City Y via road would be nice. As in, City X no longer has the food, and City Y has the food. At least so long as the road remains intact.
As well as more housing upgrades ... need something better than a house. or rather, need somethings IN BETWEEN hut and house, and house can be the premier coupe de gran, just under apartment for population amounts.
Hut-10, Hovel-20, House-30, Community House-40, Apartment-50, Apartment Complex-100
^ this I would like to see