Is there any way in Mp3tag to set the date & time for the Date Modified (or created, or accessed) of files?
If not, would you consider adding such a capability? What I do now to accomplish this is to add a tag to a directory full of files, then remove the tag afterwards. This gives all files the same modified date & time. But it's always the current date & time rather than being more flexible.
One reason this would be helpful is that many music managers have the ability to list the most recently added albums or tracks, and usually they use the file's "date modified". When you use Mp3tag to correct a few tags, then the files get stamped with the current date & time and pushed to the top of "newest", when in fact the files might be quite old.
Another capability along these same lines would be to have the (optional) ability to maintain the date modified timestamp whenever Mp3tag updates a file. This is the behavior you see with FLAC when it encodes a WAV file - it maintains the same modified timestamp of the original file.