Here's the link to the Wiki page:
https://wiki.mobileread.com/wiki/Kind...bre_Plugboards
For the ", The" problem go to Preferences -> Tweaks and change both "Control sorting of titles and series in the library display" and "Control formatting of title and series when used in templates" so they both are set to "strictly_alphabetic".
As for plugins - well it depends on what you want to do. As a Kindle owner, meme's Kindle Collections plugin is a must have (except for Fire/Touch owners of course). For metadata the three you have the most useful I would recommend. Search the Internet was my first plugin I wrote and totally can't live without it to quickly google images or lookup authors/series on FF. You mention Reading List, that one I also can't live without to keep track of what is on my Kindle when it is not connected, and most efficiently queue up books to send to it. If you want to edit ePubs in Sigil, then Open With and a keyboard shortcut is the only way to go. Find Duplicates is probably the most popular that I have written - but users who have small libraries or just starting out don't need it. I could go on and on for just about every plugin I wrote - I haven't mentioned Quality Check & Modify ePub, Extract ISBN, Count Pages, Generate Cover and a few others I regularly use like Resize Cover, Walk Search History & View Manager. Also of course as a user of goodreads.com to track my reading in the cloud I can't live without Goodreads Sync either. It really depends on what itch a user has to scratch and how pedantic they want to be about their library.