I would like to know about metadata as well. Although this might be a question I might move to Qimage.
Depends what your priorities are. Most people use Qimage to get the best prints possible for their images. All this other stuff is useful but secondary to printing. Qimage already can be used as a "one-stop-shop" for a work flow: raw to print. Don't let the minor issues put you off from getting great prints.
Terry.