The Magento extension for Woopra was developed only with Magento in mind - so there's actually no relation with Joomla! whatsoever. However, any Magento extensions (including this one) can also be used within Joomla!. But as you probably noticed, with some shortcomings.
Developing a Woopra extension for Joomla! was never on our roadmap, simply because there was already one existing. But if that project has died out, we will certainly consider developing it ourselves. We'll probably develop this in February.