I am not talking about accessing the clipboard. I am talking about accessing the selection object, which you have 100% access too.
Here is some pseudo-code for you
Bind key event
-Check if ctrl+c
-If so copy from selection/range object and overwrite in temp location
-Check if ctrl+v
-If so paste into current selection area
-Check for copy button pressed
-If so copy from selection/range object and overwrite in temp location
-Check if paste button pressed
They can do it: http://code.google.com/p/js-hotkeys/ and I can do it or you can do this http://yangshuai.googlepages.com/jquerycopyplugin and another one http://code.google.com/p/zeroclipboard/