A function of duplicating an entire content folder with a changed title / url (folder name) would be fantastic. So in its simplest form, a duplicate page button?
(So far kirby2’s architecture has been outstanding in the ease of custom implementations for my client.)
You could achieve something like that with a widget and $pages->create().
Create a form in the widget to select the template page, give it a new name and grab some content off the template page.
Guess it would be the easiest to just copy the folder and rename it with an ftp command.