I have quite a few movies with two or more English audio tracks, the movie dialogue and a commentary track. Both have their language set to English and have track names.
For example, the movie Primer has 3 audio tracks: "Movie Audio", "Commentary by Writer & Director Shane Carruth", and "Director, Cast and Crew Commentary. Programs like VLC read these names and show them in the audio track selection dialogue. Plex only shows three English audio tracks, with no differentiation (other than number of channels).
The same thing happens with subtitles. A lot of films have two English subtitle tracks, one for all dialogue, and another for only the foreign dialogue. Another example: The movie Taken has 4 subtitle tracks: an English "Non English Parts" (with forced flag enabled), an English subtitle track, and a French and Spanish subtitle track. Again, Plex shows no differentiation in the two English tracks.
So the feature request would be for Plex to read the track names and display them through the various interfaces. In addition, being able to show forced subtitles by default would be nice.