Hi,
to the best of my knowledge and belief I tried to find a solution to the problem I have, so I assume the feature I need does not exist by now. If not so, this would probably not a feature suggestion but rather a question I would ask you to answer.
I like to watch my series in different languages. Mostly, I watch series in English, sometimes I like the German track better. Therefore I set my standard audio language to English. If I want to watch a series in German, I have to switch to language manually (as intended) - but for every episode I watch. This is quite annoying and I can’t think of a situation where this could be useful.
I would suggest that Plex remembers a switch in the audio language for the whole series as I think this fits user needs much better.