Hello,
When, on a map with already several cities and units, your pioner creates a new cities, the focus shift to the next unit or city before you have time to order to start building something in this new city.
This is a bit annoying when you play on a large map with tens of cities, cause you don't necessary recall exactly where you just creates this new city so you have to scroll a bit to find it before being able to build something in it.
It would be best if, when you create a new city, the focus would stays on this city in order to allow you to start building something in it... and only after the game could pass to the next unit or city.