Custom Fields

Morten,
Extra fields (among other things) are one of the primary purposes of the Profile Plugins. We have some documentation, though it's not fully up-to-date, on how to create one. We'd recommend looking at the JomSocial (or one of the others) and see what's done in there. A plugin just to add a field to the form isn't overly difficult, and we can definitely help.

The main functions you'd be interested in are:
jfbcProfilesOnShowRegisterForm - Generate the HTML for the field to show to the user.
saveRegisterFormFields - Save the data submitted however you want (to DB, file, etc)

All in all, it could be a pretty small file. For the current documentation, see:
www.sourcecoast.com/jfbconnect/docs/deve...ing-a-profile-plugin

We're in the process of overhauling some of the plugin stuff as it's gotten a little clunky since we introduced them a year ago. They do give a lot of flexibility over the registration and profile import process though.

Hope that helps,
Alex