I think it'd be a huge quality of life improvement if a mode where you select a building and click on a province will build/queue the building
Queuing a building would not construct it but would begin to build it once enough money was in the coffers.
I've gotten real tired of clicking on a province and building each on by one.
Another suggestion I think would be to lower the movement cost of constructing civilian buildings (workshop, library, farm) by 1 movement point each. Farm would be 0.4, workshop 0.8, and library 0.6. The movement costs right now are way too high.