User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-4976111-20120910014721/@comment-3492791-20120910024743

I noticed that a lot of the Dawnguard items are physics-locked rather than physics-free when you pick them up. You can still change their orientation by smashing them against the wall though. I don't know if it was just easier to have altered properties for new items instead of trying to edit every item in existence, but clearly they can do it.