I would also appreciate this feature. I have quite a few sets of dvd extras to go along with tv shows. Until some feature is added, here is my solution after hours of trial and error, testing for functionality:
+Create a new directory on your server - ex. E:\TV Extras
+Create subfolders for each show (or season) for which you want to access extras - E:\TV Extras\Game of Thrones Season 1
+Separating folders by season makes it easier to organize extras that don't belong in a specific season.
Then you can add folders "Season 2, 3, 4, 00..." as needed.
+In said folders, organize your content just as you would for a movie's extras, following the Extras Naming guide.
+Include a trailer or clip to represent that season (Game of Thrones Season 2.mp4) so the folder will be scraped as a movie. The name of the clip will be the title name in Plex.
+Optionally, add a cover to your show's folder so the show isn't represented by an extreme close-up of some corner of the trailer. Lol Some of them just don't look right.

+Once your structure is complete, add [ex. E:\TV Extras] to your plex server as a MOVIE library. Select Plex Movie Scanner and any Agent under the advanced library settings.
Surprise! The extras show up under their correct folder names with correct file names and not "Episode1" with no description!
From there, you can click Match or edit the titles. I don't have to bother renaming, since the file and folder names are already correct.


So there it is. My hackaround for anyone who watches behind the scenes as much as I do.
Happy streaming,
Micah