Have the cam pan focus on a sound as a mode on demand or schedule using an array of microphones. Smart mode would cancel focus mode when in a noisy environment. And include a sound tracking mode in case the subject is hidden and re-appears off camera. Perhaps it would be for indoor use mainly because of ambient noise triggering its focusing responce.
Is this a feature request? Does this need to make it into a wishlist?
Sound tracking would require hardware changes in the camera to do that - specifically at least one additional microphone.