We need this feature badly. Already have a highstock license.

Switching axes and being able to scroll vertically would be awesome

I would buy a license if i could do inveted highstock

Would be perfect to get a vertical HighStock chart with a scroll navigator on Y-Axis.
as described in this stackoverflow topic :
http://stackoverflow.com/questions/15207133/highcharts-hightstock-inverted-axes-with-scroll-navigator