Right now, you can't. We're working on a system for an upcoming release where you can have JFBConnect not override specific tags when in specific 3rd party extensions. However, for now, JFBConnect always must be in control of the tags and it will remove other ones.
The reasons we do this is because Facebook, Twitter, Google and other social networks are very picky about how the tags can be inserted into the page. If there are duplicate title or description tags (from your extension and JFBConnect) or incorrect tags in general (which many extensions seem to add), it can cause problems for your whole site. Because of this, we've designed JFBConnect to clean up these issues and make it the primary Open Graph tag component for any site.
I hope that helps explain,
Alex
Inserted tags from 3rd Party Extension removed
