Ich bin mir nicht 100% sicher (ich habs noch nie gemacht), aber dieser Code in einer map.ini sollte es machen:
Object DwarvenFortress    
      
  ReplaceModule ModuleTag_castle
    Behavior = CastleBehavior ModuleTag_castle_Override
          //This refers to the side and name of the .BSE file used to unapck the fortress
        CastleToUnpackForFaction    = Dwarves zwergenfestung
        CastleToUnpackForFaction    = Elves zwergenfestung
        CastleToUnpackForFaction    = Men zwergenfestung
        CastleToUnpackForFaction    = Wild zwergenfestung
        CastleToUnpackForFaction    = Isengard zwergenfestung
        CastleToUnpackForFaction    = Mordor zwergenfestung
        CastleToUnpackForFaction    = Angmar zwergenfestung
        CastleToUnpackForFaction    = Arnor zwergenfestung
        //Anything that does not fit this filter will be given to the neutral player, so the template can have rocks and props.
        FilterValidOwnedEntries        = ANY +STRUCTURE +WALK_ON_TOP_OF_WALL +BASE_FOUNDATION +TACTICAL_MARKER        
        MaxCastleRadius             = 130.0
        InstantUnpack                = Yes
        KeepDeathKillsEverything    = Yes        
        UnpackDelayTime                = 0.0
        EvaEnemyCastleSightedEvent = EnemyFortressSighted
    End  
   End
End