We’ve just added the ability to sort by rank change. When you click the heading of one of the search engine columns you get different sort options. So, it goes like this…
1st click: sorts by rank descending (from 1 – 100 – not ranking)
2nd click: sorts by rank ascending (from not ranking – 100 – 1)
3rd click: sorts by rank change descending (from -100 – 0 – +100)
4th click: sorts by rank change ascending (from +100 – 0 – -100)
This is what you get when you click the Bing column three times.