I second that. I was looking to see if I could have private listening and tv audio on. I am hard of hearing also and I have to put the sound up which bothers the others in the room (and sometimes not even in the room!!!) watching.
I also agree. My father is hard of hearing he uses private listening when we are not watching TV but we would like to be able to watch tv as a family with a comfortable audio level for everyone. Please add this feature.