P: Face Recognition of In-Focus Faces Only

As an event photographer (primarily musical theater and dance recitals), I edit large batches of photos (10,000 or more per event). Many of my images have a primary subject with other people in the background who are likely out of focus. Face recognition can be a great resource to help ensure that I have good pictures of each of the participants and to keep those images organized. However, Lightroom's face recognition feature tags faces even if those faces are in the background and out of focus. This severely limits the efficiency of this feature, redering it pretty much unusable for me. I would like to be able to have Lightroom tag ONLY the faces in an image that are in focus.