(You can copy strings elsewhere and paste them in, but that is beside the point.) I got spanked when I highlighted part of the file name and hit Ctrl+C. I thought I could simply type the date string once in one of the file names, then copy it with Ctrl+C, and paste it into the others.
I found this out when I had some files being viewed in TreeView Personal, and I wanted to add a date string to the names of them all.
You 'will never miss the features that were removed'? Did you know that in their zeal to prevent users of TreeSize Personal from 'exporting' data, they went so far as to prevent you from using the clipboard at all?