We just added such functionality to our new major version.
This is a code snippet:
renderer.config.nodesSortOrder = "ASC";
renderer.config.nodesSortFieldName = "Title";
nodesSortOrder - order, for example “ASC” or “DESC”.
nodesSortFieldName - internal name of list field or property from user profile service.
You can download the new version from our site. Note, if you use version 1.* you will need to upgrade to new version by removing old web part from your page and adding the new one.
If you need to extend your trial just send a request to firstname.lastname@example.org