Historic data for Top URLs, subdomains and folders — killer feature with hidden analytics value!
I think it would be very cool to have historic data and chart on Top Subdomains and Subfloders, so I can see how each of those is changing with time, compare quarter to quarter, etc. Even put it up on a chart would be very helpful. Currently I am getting most of that from SimilarWeb.
And historic (chart data on each URL in Top Pages -- would be a killer feature
I would pay extra for that