ask junadi83 de bodemloze on how to do thissnip
Actually I did take a look at it and the value of recolonizing is already very high for the AI, especially on very hard and legendary. There's no point of increasing it if it works at all. I noticed than in vanilla during the first few turns the Skull Takers usually destroy Pfeildorf and the Red Horns destroy Norden. Only 1 or 2 turns later you will see Averland colonizing Pfeildorf and Nordland colonizing Norden. When Kislev is at war with Varg and loses Zoishenk or Fort Stragov or Erengrad you will see an army of Nordland or Ostland immediately comes and claims those ruins without waiting. Same with Kazhrak destroying Carcassone/Parravon and then Estalia comes a few turns later to recolonize everything. The key factor is that the AI has to be in a peace state of mind. CA designed 5 states for the AI: peace, tension, war, total war and last stand. At peace the AI recolonizes like crazy but it seems to be disabled when it is in one of the other states. I absolutely don't know how to change it if it is possible at all. Besides I will stay away from changing the CAI behavior on the campaign map because there are tons of values, half of them nobody knows what they do or even if they work at all (most of them were here with Shogun 2 then Rome 2 then Attila, a whole bunch of them are certainly obsolete). To change the AI's behavior, if it is possible, you will need to tweak those values one by one then see if it does something in game, then change them again, repeat etc. This would take weeks if not months of work!
he probably knows how to do this