This is a great mod Gedemon
Playing v.4
Played the scenario twice now, game crashed at turn 40 for me as Germany (and I had no save, so decided to restart the game as Italy, and now it crashed at turn 41). Not sure what is causing the crash however but I can upload a save on turn 41 if you want to check it out.
Italy turn 41
http://www.mediafire.com/?b13bb5a058bu16d
Germany turn 40 (Managed to use an auto save to recreate the crash...)
http://www.mediafire.com/?gkvi5a2rk8l8u8t
Some other issues seem to be that the AI ignores lost terrain, for example even when they turn the war around they don't recapture manufacturing plants.
A message displayed both my games, saying something like "France is losing the war and have called in reserve troops"... and then they get a free settler every turn... and when you capture it it turns into a worker for you.
Noticed in the spreadsheet you plan to add oil cost, which is awesome unless the AI is punished too badly. I think you should consider throwing in steel/iron as well.
Awesome work so far, keep up the good work
One question, do you plan to use the social policy tree to anything?