Thanks, everyone, for responding. I struggle with the more technical side of TiddlyWiki, but so far wrangling it has felt worthwhile. Good to know that I should steer clear of list-before/-after for this purpose. I was looking for any tool that might do the job and am not clear on best practice.
Mark, I'm intrigued by your post as a beginner and will have to take some time to figure out what each part actually does. It certainly reminds me that I should learn how to use regular expressions. Avoiding "===" is not a problem! And then I suppose one could set up redirects like Wikipedia has to send the missing Bell Jar tiddler on to The Bell Jar? (Or transclusion?) My issue, though, is that I wish one thing could be used for sorting (Bell Jar) and another returned for display (The Bell Jar). Displaying "Bell Jar" is functionally pretty similar to naming the tiddler "Bell Jar" when it comes to all my lists.
Mat, your post was deleted as I was responding, but here was what I had typed: Mat, that's an interesting solution! But I can't seem to get it to work? It actually seems to do the inverse--it sorts as if the "The" was present, but displays "Bell Jar". For example, I tested just a small selection of titles, two with an initial "The", and the resulting list appeared in this order: Bag of Bones, Beatrix, Tales from Earthsea, Bell Jar, Tempest, Treasure Island. (Am I using the filter incorrectly? My filter was just based on a temporary tag, so all it is, is filter="[tag[book1]]".)
I'm willing to accept that perhaps TiddlyWiki doesn't yet have the functionality I want, but either way, I appreciate the look at different ways to problem-solve.
Also, would it be worthwhile to join Github and chime in with some support for the feature on that thread? I don't know if it's meant mostly for technical suggestions and solutions, or if a simple confirmation that another person would find such a feature useful is... useful.