I have implemented the AreaRange a few days ago and the result is great, you can see an example here: http://buijten.fr/HighchartWithAreaRange.PNG
It would be great to have two additional functionalities with this feature:
- Having different fill colors when the range lines flip, as per this example: http://buijten.fr/ichimoku-example.PNG
- Different line colors for the range limits (though this is achievable by adding additional lines as I did in the example)