I just discovered this site and inmediately googled "xbmc torrent butler" and I found this thread that was made yesterday lol.
It'll be really sweet to have this kinda feature. It is similar to the fully automated media center in this thread though:
http://lifehacker.com/#!5475649/set-up-a...dia-center
But with torrent butler one can pick the movie directly from xbmc and hopefully it can be renamed and added to the library automatically.
Also a similar thing would be to use the addon Pelisalacarta, specially the channel Cuevana, which has tons of movies in a fair quality and they're subtitled (or not, its up to you).
Still I think torrent butler would be nice.