Was thinking along the lines of copying a prop and pasting but I guess instancing pretty much does this now(or you can just keep adding the prop).

I would love to be able to select anything in the scene tab and copy and paste. but I guess there would be a huge amount of varibles to do that.

Pretty much how you can (copy figure) it would be good to be able to (paste to new figure). As a oppose to having to load the figure and then paste the presets to it.