Duplicate spreads/pages must merged with Move Spreads/pages and provide a dialog instead of dropping duplicates in the end of the current do
The pages, duplicated through "duplicate page menu" are placed after the last page, which is usually the last page of the cover. They aren't needed there. Frankly speaking they are needed elsewhere. The duplicated spread should provide a dialog similar to moving page with the same options. That why it is user friendly to merge those options in one dialog.
Even the current implementation of the move dialog would work if the option to keep the moved pages was awailable for the current document. I don't understand why it was blended out in the first place.
The dialog must be prepopulated with the currently selected range pages. Aswell as destination for the current document should be by default the next page after the selected range.
We could even leave the duplicate option on it's place if there is any poor soul who would like to keep using it.
See the attachment.
Dixy Danks commented
Pros for the Developers - very easy to implement. You will just have to change the title, captions, and disable the limitation of copying pages into the current document, without deleting them in the original position.
Right now we are even able to duplicate pages via Move page function, but only across documents, why???