Duplicate objects by Alt+Dragging them
As someone who is used to Adobe's applications, Sketch, and other graphical editors, the ability to duplicate objects by holding Option (Alt) and dragging it has become a staple that makes editors lacking this functionality a pain to use.
Adding this would speed up the editing workflow greatly and make duplicating objects feel less manual.
Max Rahder commented
I agree. One use case is when I change an anchor slide, and then need to use it throughout the deck. Now, I have to edit, add, duplicate, then go back to "arrange slides" and drag. It would be so much easier to Ctrl-drag or Alt-drag to do that.
I agree! Though, I should add, there should be a way to duplicate objects automatically when dragged in Presenter mode. For that matter, you should be able to drag items in Presenter mode in the first place (If you specifically want them to)!