If you thought of adding and deleting labels, why wouldn't you think of editing them? I'm working on hundreds of pages with slightly varied labels and since no edit facility is available, I'm writing item1_bla_bla_bla and then instead of copying this page and editing the label with one character edit, I must instead retype, item2_bla_bla_bla. And God forbid, I forgot an "a" in the second "bla", there's no recourse but to delete and retype the whole label. Not very intuitive.