Mass delete of unknown faces in iPhoto.

When I take photos in a crowd, iPhoto spits out multiple unknown faces. I have no interest in identifying those people. I don't even know them. The software retains all of them in the Faces section of the Library for future identification. I have 12,000+ unidentified faces. I know it's probably tiny bits of information, but they can add up when you have tens of thousands of photos.

Individually deleting them is a pain. After I have named the primary subjects in my image, its there an option to en masse delete Unknown Faces in the image? A quick key would be golden. If not, how is it that a person can put that feature request bug in the ear of Apples software designers?

Thanks