Sorry if I am getting lost. I see no complaint about copy being in those two. Why not?
But Copy>Paste is a more comprehensive versatile way is it not? (You can keep on pasting in all sorts of places forever (Ctrl)!)

As a note, it is not often I see someone mentioning keystrokes here.
One of the design theories of MoI is to make it pad/pen friendly, minimising keystroke use as much as possible.

(Or am I missing your point--sorry if so)
Brian