External uploader name

It would be helpful to be able to track which external users uploaded which images by either adding their email address to the metadata or requiring them to put in their name.

When I get an email telling me files have been uploaded I can see the email address used, but once I'm in Asset Bank I can't see who uploaded which files in the external uploads folder. It would be helpful to have it logged somewhere so I can contact them if I need further information about any of the files.

It would also be useful for external uploaders to be able to optionally add metadata.