[Fma15]

I'm not sure that this will completely meet your requirements but have you looked into System/Player/Language settings? I'm using / instead of enter. I'm pretty sure this would help.

Unless I'm missing something I don't think that'll work for me. My main language is English, so I want most shows to be on English. If I watch an anime though, I want the language to be Japanese with English subtitles.

I can fix this in the plex app using pastatool.com, but Kodi doesn't seem to listen to it.

--edit--

I found a way to do what I want. It would be more convenient to do it within Kodi itself, but I won't be greedy. If anyone else wants to do this download JMkvpropedit. Edit every audio and or subtitle track and turn the default to off and only leave the track your want as on.