Thank you for your reply!
I didn't know the toolbar was actually responsible for most of the functionality of Editor-Autolist, and by extension
Editor-Autolist-Markdown. I never used it, and I don't use keyboard shortcuts for formatting since I format by hand - unless it's indentation, in which I curse myself out for automatically hitting Tab to indent a bullet and forget it doesn't work in TiddlyWiki without Editor-Autolist.
Also, I apologize for my mistake: Big Text Area isn't a built-in feature, but an add-on to Stroll under
Goodies.
It's not included in Stroll by default, which is probably why you
weren't aware of it. I myself only came across while looking through
David Gifford's TiddlyWiki Toolmap.
Furthermore, I forgot to add that I'm fairly new to TiddlyWiki: I've tinkered with settings and plugins, and I'm familiar with HTML and CSS, but that's it. I confess I'm no coder and have no idea how TiddlyWiki works under the hood. However, I'll try your suggestions and report back my findings.
Again, thanks for the help!