The copy history item is available from the Edit Attributes page for a history item. It would be more useful and a bit more logical if this option was available from the history drop down menu on the right and the history menu in the saved histories page. 

The reason/advantage to this is;
* The history item copy page offers the capacity to copy one or more items from the history, it is not limited to the history item you click to the page from
* It is much easier to 
          * copy items between histories by selecting the option from the history menu, or from the history menus in the saved histories page, VS
          * opening a history, clicking on an edit attribute, scroll to the bottom of the page, click copy history item

My apologies if this seems picky but I do this a lot.

Cheers
Dennis