Personally, I don't see the point of ladders on battle, laddering up to roofs does seem unfair to me. So allow them on duel(already used for practicing building why not ladder throwing) and siege. It would make siege a lot more dynamic, not just people camping specific spots, we'd actually need to watch the rest of the wall. I know I would find siege a lot more fun, and the 4 slots idea from some guy was also good.