One nice feature would be a "follow the next page button" mode for following serials like web comics. Instead of starting from a home page and following all links to a given depth, you would give it the URLs for page 1 and page 2. It would search page 1 for the button that leads to page 2, and then it would find that same button on page 2 to get page 3, and so on. In other words, it would simulate starting at page one and repeatedly pressing the "next" button to read the whole serial.