Since I haven't made a Kingdoms mod before I haven't researched Permanent Stone Forts (PSF) in much detail. I know that in the Kingdoms' Crusades Campaign you could build PSF and they would remain on the map, while in the Britannic campaign you couldn't build them but they could reinforce your cities. So I could allow generals to build PSFs.
I've also heard that it's possible to turn PSF's into castles by changing their battle models. This could be useful, since it would free up some provinces that used to contain castles. Though this would create recruitment problems, since there'd be no where to build castle buildings (though if cities were divided into economic cities or military ones).
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