You mean the toasts (the little boxes that pop up after you perform an action)? We have a standing action item to change them over to the newer-style bars that appear at the bottom of the screen after an action, usually with an undo option. Would that be sufficient, or would you rather have nothing at all?
Yes, this is a great idea. I'd love to turn those off as well. In fact, why do we have them? Let's just get rid of them. You know the mark read action worked because you got kicked back to the feed list.