Another one that would be good to have is a moving average of buys volume / sells volume over windows of e.g. 10m, 1h, 3h, etc.
The charting library we use supports post-processing with moving average. See the input box at the bottom chart at
http://dygraphs.com/tests/range-selector.htmlIf it's ok we can easily add that input box for moving average window size to all the charts.