Draw walls within 'organic' rooms

currently you are only able to draw walls within the confines of a 'regular' room. this makes it difficult to draw fences around buildings. (need to make a 1 tile thick perimeter 'standard' room, then change wall type, then manually delete either the inner or outer 'ring') this also leaves mismatching textures near the wall. currently you can place a large 'organic' room over everything with 'place objects' turned off, which doesn't alter anything inside of it (or the floor textures). if you were allowed to draw walls within an organic room you could make fences much easier. it also could probably be used creatively for other things. another option would be allowing you to place more than 1 squares worth of freestanding walls at a time.