In principle give this feature a +1 also and it is already on our internal list of features we want to add. It is just a matter of resources and it has to been seen in the context of the ever growing list of feature requests.
There is a little trick that might be helpful. You can force two items to be detected as duplicates by adding a common identifier (e.g. url or doi). Then they will appear in the list of duplicates and you can merge them.
E.g. just add "google.com" to the URL fields of both items and they should be flagged as duplicates immediately.