Im not going to get into how much I dislike most of the DRs, but assuming I liked them, Id love to see a room where you could go in, pick any DR and theme of it, and practice it without winning crowns or heat. I would be in there all day no joke. Perhaps add Vana to it as well. Just the boss.
Why not just make a practice area for any piece of equipment (weapon, armor, helm, or shield)? Not that something like that hasn't been suggested before...