Have a button for touch users to enable zooming mode
Currently most touch users don't realise that the correct behaviour is to drag with two fingers to scroll, and one finger to zoom. As such they try to scroll the page with one finger, and find themselves zooming the chart instead.
A simple fix would be to put a "zoom" button that has to be clicked to enable the zooming mode. Ideally this would only show on touch-enabled devices, but probably be good to have the option to have it for normal mouse users too.
Agreed, would be very cool indeed.
I was planning to do this myself using a jquery model to blow it up to full screen size on tablets/phones. But i dont know how to add a custom button next to print/export.