Proper English Title Capitalization has been updated, primarily to provide compatibility with High Sierra. But I also added a Dry Run Log window to pre-flight the changes before actually affecting the tracks' tags in iTunes.
Until now, I had logged this stuff to Console.app. Blech.
I also had a look at a problem with capitalizing words if they followed a colon (:). I think most conditions are covered. Essentially, if a word follows a colon, it's capitalized no matter what.