I understand that this is going to be a difficult adjustment, especially for long-time users. ALT+SHIFT+V is already in use (it invokes the View menu from the top menu bar). I also considered CTRL+SHIFT+V, but that is in use by Firefox as well (paste as plain text).
All those permissions are needed for Clippings to function. Go to the following page to learn more about the meaning of those permissions, and why they are needed: http://aecreations.sourceforge.net/clippings/permissions.php