Here are my two title-case MTA files: Title Case Action Files (Mackie) Link updated 22 April 2016
They add a series of corrections after running Mp3tag's Mixed Case function. Included are editable lists of abbreviations and acronyms that should be upper-case. If you open the MTA files in Notepad, you will see comments that describe each element in the action.
Note that my tag field actions cover just three fields and are slightly different for each field. That is by design but of course you can edit them as needed.
My regards and thanks to the posters here (including DetlevD) for the examples and explanations that I drew upon when creating these files.