As microtorrent has, labels for each download are useful, for example in series seen/not seen.
I'm using TED, (Torrent Episode Downloader) with transmission it would be great a function or a plugin like TED inside the same transmission, as TED is a java program, it would run faster and use less resources.
I understand english, but i download subtitles for friends, and it would be very useful a plugin for finding them