Thank you for the stored template idea. I tried it and I believe it would work, but after saving the stored template and returning to the Preferences screen, when I try to close that screen, Calibre freezes. I tried adding the Template Functions button to the menu and accessing it that way, but Calibre still freezes when clicking the Apply button. Not sure if this is because of my library size or an error, but either way, unfortunately, this means it's not a better option to update this periodically than to update a custom column.
