Thank you, blgentry and eve.
I do rip my DVDs using MakeMKV, but have found ToolNix impenetrable. I tried using it once to "trim" a video file and just couldn't figure out how to make it work. I guess I'll have to give it another try.
I'll have to try renaming various files during ripping with MakeMKV. I never thought to do that. As eve says, the filenames are generally unhelpful: English 5.1 DTS, or English Stereo, or something similar. Recently I mostly want to get rid of the soundtracks with director/ cast commentary. I don't think I've ever enjoyed one of those. Conversely, with foreign-language films, I generally watch in the original language with subtitles. Spaghetti westerns are an exception, of course.
I am not sophisticated enough to take video from one release and mix it with audio from another release. Whoa... :-)