It would be great to have this! If I start playing a movie with foreign audio without subtitles, which happens once in a while, I want to be able to go to Plex on my iOS device, and grab subtitles directly through the application. Please make this possible!
I assume you want what is already described in this feature request: http://forums.plexapp.com/index.php/topic/46215-popular-subtitle-plugin-in-pmc/
In my comment here I expanded on it: http://forums.plexapp.com/index.php/topic/46215-popular-subtitle-plugin-in-pmc/page__view__findpost__p__293030
If that is the case, you have to vote there. No idea in having many small ones instead of one big one :)
