A different approach was implemented in Plex Server now (as of version 1.18.3.2111):
Episodes in the same file are marked as ‘watched’ too.
Duplicate enqueuing of the same file is prevented.
If you want this thread to be closed, thus releasing all of your votes to spend on a different request, please say so.
(Each user can also remove his vote manually, as long as the thread is not closed, yet.)
