Not yet. That will be in our v4.3 release, due out in October. We'll have an easy plugin system to add nouns to pages on your site and verbs that users can 'do' on those pages. We're planning to support both passive actions ('I read article 'x') that occurs automatically on a page view, and intentional actions (I donated to blah). The intentional actions is being worked on, so I can't guarantee that will make it in the 4.3 release, but the passive system is almost done.
We'll supply plugins for some internal Joomla functionality (articles) as well as supply some plugins for 3rd party blog, shopping cart extensions, etc. There will also be a very simple API for end-users or developers to create their own actions.
Hope that answers your questions, but if you have any others, just let us know!
Thanks,
Alex