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TextPad could be improved by letting users access their frequently-used files from "File menu>Favorites>list of files."
TextPad would also need an "Add to Favorites" and "Delete from Favorites" capability.

The File menu's list of "most-recently-used" files isn't sufficient for this purpose, because your "favorite" files quickly get bumped off it when you open new files.

This is how I would use the new Favorites feature:
I'm doing edits on about html 50 files.
I use a text file (say Status.txt) to keep track of the status of the edits.
I would add Status.txt to my "Favorites", so the next time I opened TextPad it would be easy to locate Status.txt.

The workaround I'm currently using is to open Status.txt in another brand of text editor, while editing my 50 html files in TextPad.

You can create a folder in Exporer and save all your workspaces there. You can also configure a TP shortcut to open them in a new instance using the -m option which starts another instance, regardless of the setting for "Allow multiple instances". See TP's help under "Command Line Parameters" and "How to Use Workspaces: Overview".
Another way is to use the @-files, from TP's help file:

"@-files" are normal text files containing a list of file names one per line. They can be used on the command line and in the Quick Open dialog box, to make TextPad open all the specified files, and in the "In Files" box on the Find in Files dialog box, to specify the list of files to search. Simply precede the name of this file with an "@" to make TextPad look inside it, rather than open it as a normal file. (Note that the "@" character must not be part of the name of the file.)

HTH