I would like to propose a new feature. It would be great if one could group the bibentries by years. I have already implemented the feature locally and works quite well. If you append "groupByYear=true" to the [bibtex file=..] tag, all entries will be grouped by year with a
between each group.
The only open question is how to handle entries without a year. If you are interested in using my code i can send it to you.