Ryan,
JomSocial's registration process is very different than JFBConnect's and they really can't be 'merged'. If you're using the JFBConnect - JomSocial Profile plugin though, you can add the JomSocial fields to the JFBConnect registration page so that they are filled out there. That also has the benefit of being able to hide the fields that are being filled in by using the user's Facebook profile, which cuts down on the amount of information the user needs to provide.
If you're not using the JomSocial Profile plugin (it comes in the JFBConnect package), please install it, enable it, and configure it in the Profiles area of JFBConnect.
Hope that helps get you started,
Alex