add the capability for HighStock to project future growth based on the past data.
If we have a series that over time is always increasing like this one: http://plus.tehk.org it would be nice to be able to ask highstock to plot a dotted line of future growth based on the average of all data for the period of data displayed. For instance, I would like to know when my count of G+ users will hit 1 billion. I could add this projected point to HighStock js and it would plot out the estimated growth out to this date.
It's easy enough to calculate this yourself and add a series for the projected line.
Almost easier than if you had to set options in the chart for it to handle it for you...