as for 2), the email shows up now. initially, the email showed up, but it was the email field from CB (in jfbc the setting was "hide email"). so that worked as it should. in this respect, what is the reason why the username is not filled in with the name of the fb user? any letter that the customer needs to type makes a good impression.
i did some testing on another site and there the automatic activation works, so its defenitely a configuration issue on my side (most likely due to the extensive testing).
unless other people make similar postings here, im sure youre time is better spend on further developing this treasure

but i appreciate the offer.
if i figure out what the problem was, ill post it here.
cheers