Mp3Tag is so powerful that I use this app as my default audio file Renamer.
For simple add / replace / delete of text in a filename there are, to be honest,
some 'more user-friendly' apps (for non-technical type of users) out there with
a nice and tidy interface (eg Winsome File Renamer). Yes, Mp3Tag can itself,
without any reference to tags, add / replace / delete using $replace and $regex etc.
But there is one Renaming task that Mp3Tag, and many other Renaming apps, cannot do (or if some can,
not in a user-friendly simple manner). And that is to be able to simply paste a list of text over an existing
list of text (eg filenames or, for that matter, a column of tag data).
One app that can do this is "Everything". So I have an Action in Mp3Tag that in effect transfers selected filenames in Mp3Tag to Everything.
But it would be nice if Mp3Tag allowed pasting of multi-line text in any of its columns (eg the %artist% tag column), but especially the Filename column (perhaps, as in Everything, this can be done in a separate pop-up dialog box with two sections - old text lines / pasteable new text lines - before transferring the 'new' column of text back into the main Mp3Tag window).