Here’s how to add the events with jQuery:
http://jsfiddle.net/highcharts/5V33F/Sarah Forst commented
This seems almost like a bug to me. For example, in this chart:
I want to bind a behavior to mouse over of both a pie wedge and a legend item. If I hover over the pie, the wedge highlights, the legend item highlights, and my event is triggered. However, if I hover over the legend item, I get the first two behaviors, but no event. This seems inconsistent. I am implementing the jquery solution, but it would be nice if this was built in.