I would also like to have this feature enabled. Although I've been with a seedbox provider who is running the same rutorrent version as my current seedbox but I was able to add more than one .torrent file at a time. So definitely some people out there have been able to get this working. The Add button box shows an the option to Add Files (as opposed to Add file) and I was able to select (holding down shift) more than one torrent file.