I would just like to chime in and say this is the most constructive and mature forum thread I have seen since this forum was created, Awesome job community!

All these idea's are great and I think they can all have a place in the final product. I really like the idea of repairing buildings after a battle, but I think there should be some heat of the moment repairs as well such as repairing a wall to prevent it from falling. Maintaining a defense tower and such. this could also be an opportunity for a new Crafter such as Architect that can construct these walls and towers.