This seems to be only available in version 9. We're on 8.1
Also I'm not looking to require editor to create separate child pages, since that adds to the complexity of content creation.
I'm seeking out a solution where on the form input of a page, if there are repeating structured elements on that page, the form allows the creation of one or more of those elements.
I'm beginning to sense that the easiest way to accomplish this is to extend the CKEditor toolbar with a new button that will inject the HTML markup of the repeating elements. So rather than depend on Kentico CMS to create the data structure of these elements, I'll simply create them inline within a Long Text field.