[eluser]OverZealous[/eluser]
@PoetaWD:
Did you enable the extension? You need to add it to either the config/datamapper.php config file, by adding it to the array under $config['extensions'], or by adding it to the Area model's $extensions variable.
If you did add it, let me know where you added it. I'm slowly working on building a better set of example code that I can test new features on, so I can't discount that it is a bug.
I haven't made it to my P.O. Box since returning from vacation, but I'll check this week!