It would be a nice feature to be able to choose the so called "undetermined" subs as preferred subtitle language. This way when using different subtitles languages for different shows would make it very easy to automatically pick the undetermined external subtitle in the language you prefer for that movie/show.  Example: For Show X you prefer English subs, for show Y you prefer Italian subs. You just put a srt-file in the language of your choice but without a language tag into the shows fol