I would like to see a setting that allows for a default subtitle track when the main audio track isn’t your preferred language. Something like “Automatically enable X language subtitles when default audio track isn’t X language.” For example, if you can understand English and don’t understand Spanish, but the main audio track on a video is Spanish, it will automatically enable English subtitles. Plex has had this feature for a while now, and it is quite handy.
I’ve seen this requested a several times by different people over the years with no official response.