David Kapell

Just to confirm, if I were to update to Copenhagen, and then customize that theme to the L&F that we use, I'd be able to use this feature, just not get further updates, correct?

I don't believe so, I'm using a theme that I forked from one of the defaults when the "new" end user interface was created, many years ago.  Is this only available in Copenhagen?

When I went to implement this, the editor refused to let me save, due to the error "request_form doesn't accept any arguments or options".  Is there an additional step to enable this functionality?