The game mechanics don't really allow for something like this. There aren't appropriate event triggers even if we wanted to create the thousands of events needed for it. So, sadly, we can't have this.1. I think provinces' infrastructure should be damaged while there is fighting in the province or someone is occupying it. This could represent the devastation of wars. For example after the WW1 Europe was in ruins. More men and more advanced military technology = more damage to cities and roads. I also think local people should suffer some casualties as well.
Well there are events for each uncivilised country to balance back out after civilising so that they don't get the same penalties as they did when uncivilised. Playing catch-up is something which is hard, but by no means impossible. It just requires converting a larger proportion of your POPs to clerks really.2. The civilizating system in this mod is great! But the problem about civilizating countries is that catching up in technology is hard or impossible. There should be atleast some sort of flow of ideas from Europe to newly civilizated countries.
Some events that give tech or give a chance to pay some money to receive technologies. So that countries after civilizating should become technologycally average and have at least a chance to catch up.
I'm not sure what others think on this point, though. I think it is fine as it is, but others may want something done too??