Hi, My name is Igor and i am from Serbia. I think that i am older player here, i have 42 years and more than 25 years i play the games (first game i play on ZX spectrum) so by my experience i have some suggestions:
1. Keyboard Letter assignment for other buildings (custom assignment )
2. Building progress menu can be smaller or to have auto hide option also and for menu on bottom.
3. Custom editing for building
4. Offline mode and when go online to update all what you do offline
when i have more idea i will post this.
I hope that you will like my ideas and that this idea is not in some previous threads because it have too much to look in this threads.
See ya!