Open copy of active document

Hi everyone,

Opening a copy of an InDesign document is something I do all the time, and I was wondering if this step could be done faster with the help of scripting.

While searching around the web, I found this script written by Dave Saunders years ago, which for some reason only works the first time when I use it, then it just makes InDesign lagging like crazy and nothing happens. What could also work for me is to be able to open a copy of the active document, in a way like Photoshop does with the "New Document" option from the History panel. Does anyone know if such a thing would be possible with some JS magic ?

Thanks a lot for any help.