While there should be a little more incentive for kingdoms to not immediately go to war right after having finished one, I don't think peacetime should be something that most lords are happy about. Citizens and such, merchants, yeah sure, but most vassals in the game want to go to war because going to war is how most of them became more powerful, and most kings are on a personal quest to conquer other nations because they just don't like the fact they exist as they do.
Especially in Calradia, where the intro states that a long lasting peace is what caused the continent's nobles and kings to become restless and initiate a civil war. It wouldn't make much sense, as strange as that sounds, for the kingdom's ruling class to be happy about peace.