There have been some changes made to JFreeChart to make use of the element hinting feature in JFreeSVG, but these have not been released yet so you would have to look directly in SVN, for example:http://sourceforge.net/p/jfreechart/code/3293/
Each renderer class needs to be modified to add an element key as it renders each data item. Some renderers have been updated already, others remain to do. I'm not sure when JFreeChart 1.0.20 will be released, I would like it to have been done already but I have many competing priorities.
You should read that post to get an idea of the mechanism, it will be pretty much the same approach with JFreeChart. I hope that helps a little.