Hi Alex.
OK, I can see how that works now. However, perhaps something you might want to consider for a future release is having the best of both worlds. As you mentioned, we can allow the users to go through the normal registration process, but on some sites, like mine, a lot of the fields we define cannot be covered by social networks (or in some cases, FB is being ultra restrictive these days).
What I'd like to see is pretty much what's already there, but allow JFBC to give the opportunity to the site owner to allow ES "quick registration" on a selected profile, allow it to fill out the username with the default method chosen (e.g. FIRLAS), but then present this to the user signing up to give them the opportunity to change it before proceeding with the usual Quick Registration offered by ES.
Dave