well.. in a walled town/city or for that matter a rural area with a citadel of some sort of the local lord, you normally won't fight every turn. there's only a fight if those inside sallies forth or those outside mounts an attack with engines of some sort. or they might even shoot at each other until kingdom come, or until food is gone. that is... food inside the walled bit and food outside it are tallied separately... they might not get much of a harvest when besieged (bar smuggling) but they shouldn't have to feed all the pop outside either.
which is basically what the game is missing.
it would be interesting with the new map thing to have the concept of a local lord's keep/etc in any and all types of regions.. size of which depends on the rank of the lord? which can be bypassed at will without triggering fights with militia if they don't come out.
