I know the extension isn't your project, Al, but maybe it's something you can set on your end, rather than needing a extension update? I have no idea, so I'll throw it out there anyway.
When I'm uploading stuff and hit upon a dupe, I notice that it'll add any tags I picked that weren't on the image already. This is great, because it'll automatically slap on artist names and such that might not have been there already, without making me do it again, manually.
Is there a way to do the same for the source field? Often I up an image and even if it's a dupe, the original poster sometimes didn't leave a source url. In that case I'll just paste in the url, but is there a way to just do it automatically, as with tags? i.e., on uploading, if source field is empty, insert the URL I'm noting via the extension.
Again, if this isn't anything you can do on your end, feel free to ignore.