Satyro,
Can you explain what the actual issue is? The "Registration Component" selection is a method where you can allow the user to register using an existing registration flow other than what JFBConnect provides by default. Currently, we only support JomSocial and EasySocial for alternative registration flows. Even if you're not using one of those extensions, the standard "JFBConnect" registration flow will work for any other extension and the user's that are created using JFBConnect should work just fine.
For more about the "Registration Component" feature, please see our
JFBConnect v5.2 announcement post
from late last year when we introduced the feature.
So, if you can explain a lot more about your configuration, what isn't working properly, and any error messages or issues you're running into, that will gladly help.
Thanks,
Alex