Just had a thought that it would be flippin' awesome if you could destroy the Pillars holding up the Top Floor Exterior of Outposts and inner keeps, if all of the pillars are destroyed then the supported Top Floor Exterior could collapse downwards, meaning players can no long stand on it above but also blocking the main gate.
Also perhaps it would be possible to make other things in PvP more destructible too such as the towers of keeps.
House Baratheon: 'Ours Is The Fury'