For the AppleTV (mainly my previous-gen 720p version), the AW's Remote app sends swipes and taps with better reliability than the iPhone app or my [older style] hardware remote. Don't know why, either.
Another feature I've realized I would like, but don't really need, would be the ability to re-sort faces I've created. I've added a couple variants lately, and I like them a lot, but they're all the way to the right, while my most-used variants are to the left. I could whittle down my stash and redo them without too much effort, but it could be nice to put a new favorite next to my older favorites. I don't know what the user interaction would need to be without overly complicating the face-choosing process, though.