Could you possibly add an option in trainer for Super Relations or something? So you can overextend, annex or randomly attack without penalties?
For the question above.. Activate super city development and then select one of your areas and build something. If there all slots are full delete something. Then it will work. Just be careful because this cheat for some reason also works on bots. If you click on their areas while they build something it will also grand them max development on that province. So when you done with your areas each time, turn it off.