Julio,
I honestly can't say I understand why you need to single sign on buttons. However, I don't need to know

It's your site. If things are working how you want, that's what matters!
If you run into anything else or have any other questions or feedback for us, just let us know. We'll gladly help however we can.
Please note.. for the upcoming v5.1 release, the jfbconnect_user_map table will be changing to accommodate more authentication providers (Google+, etc). When you upgrade to v5.1, you'll need to update that query. It'll be an easy change, but just want to make sure you take note and are aware of the change.
Thanks,
Alex