Off Topic two-penneth worth - I don't think the existing index lists all plugins (e.g.
https://www.mobileread.com/forums/sho...d.php?t=268279 ), also I would think there are enough plugins now to warrant having it in alphabetical order.
Could a convention be established such that threads in the Plugins subforum that contain a PI be prefixed with "[Plugin]", and could the 'title' that follows match the index entry, and the the zip file name. Hence, there would be a "[Plugin] Shady Characters" thread, listed in the index as "Shady Characters" and its zip name would be "ShadyCharacters-v??????.zip'.
Calibre is not the only software that informs user of updated PIs at run time. Notepad++ and browsers spring to mind. If MR provided RSS feeds for individual fora/subfora, then that would be my preferred notifier. That's how I get notified of updates to plugins for my file manager.
BR