Dynamically adding, deleting and changing order of pages in interactive designer

From what I can tell, there is no way for a client to add pages to a template even when it is in interactive designer. We are looking at some products where it would be very useful if clients were able to add pages and reorder them to allow for more customization. Ideally this would be a feature that could be toggled on or off so that it is only on the specific templates that need it.