Idea Summary
Now we can duplicate an item or a region, and drag it where desired. This is not the best way to copy something when you have very large pages with lots of items or regions, as  the drag and drop can be very far from the original position, or in a sublevel in the tree that you might have not expanded. It would be nice to have a simple copy and paste function with keyboard shortcut support.

Use Case
Improve developer experience. With a no-code language like apex, copy and paste is a very common thing that should be as simple and fast as possible.

Preferred Solution (Optional)
Support copy and paste with shortcuts in page designer, copy an element, select destination and paste it. It would be even nicer if you could select multiple elements and copy them at once, or even between multiple pages of the same or different applications. Even better, a clipboard history.