Nope
First step is copying the /socialprofiles/jomsocail/ plugin to your own plugin name. Update the names from JomSocial to whatever you call the plugin. The *only* functions you should need are:
__construct
prefillRegistration
getProfileFields - Returns an array of fields to be displayed in the JFBConnect -> Profiles configuration area (see the K2 plugin for a real easy example of this)
processField (possibly, if you need to manipulate how a field is shown)
Steps:
* In __construct you need to set the registration_url to the page your form will live on and change the displayName to your plugin name
* Install your new plugin
* In the JFBConnect -> Configuration area, set the Registration Component to whatever you set in the displayName field
* Then muck with the prefillRegistration function to grab the user's profile data in the $profileData object (already done) and use prefillRegistration to set the data in the form (it sets it as though the user POSTed the value, which works for most forms).
That's the really short and skinny of it, but hopefully it helps give you a starting point. Let us know when/where you get stuck!