Mandatory moderator label

Is it possible to make it clear when a mandadory modearator is applied to a post? At the moment, when there's a mandatory moderator it's not necessarily clear that this moderator can't be removed. It only becomes more clear when an optional moderator is applied (as they have an 'x' beside their name): There's also a slightly strange behaviour if you try to delete a mandatory moderator with the keyboard (backspace):