one of the biggest problems with copy/paste right now in pd is, that if
you copy a large amount of objects and you want to move them, but miss
to click on a selected object, and instead move another objects which is
close to a selected one, then you 1) unselect all copied objects and 2)
move the wrong object. in this case, you can only  undo the last action
(moving the wrong object), and end up with a big mess of copied objects
at places where you don't want them.