Yes. Actually, you should use FbClient like so:
require_once (JPATH_ROOT.DS.'components'.DS.'com_jfbconnect'.DS.'helpers'.DS.'facebookhelper.php');
$fbClient = JFBConnectFacebookHelper::getFbClient();
Then you can do things like getting the user's fb id and check if the user is logged into FB:
$fbId = $fbClient->user
if ($fbId)
// do something for logged in users
The client is a reference to the following file, so you should be able to call any functions from that file to get user's friends, photos, etc. If you come up with something neat, let us know!
/administrator/components/com_jfbconnect/assets/facebook-api/facebookapi_php5_restlib.php