I have been doing face detection on many images with large groups of persons. In most cases, only a small minority of the persons are tagged with face names. Instead of having to click many times to "Ignore" all the other faces, it would be a real productivity improvement to have the option to accept an Ignored status for all remaining non-named faces in the image.
Select all and click ignore on the active overlay over a thumbnail. Maik
In addition, the function to ignore all unconfirmed faces in the context menu of the right mouse button is available in the image preview, e.g. for images with groups of people. Maik