Nope, no ticket system. The vB import is for vB, not for add-ons, so importing isn't going to change the
GAZ
database tables. You could uninstall and then reinstall
GAZ
but that means you would need to reset all your newsletters and issues, or you could code something to add the new users to the gaz_subscriptions database table where a value of one in the newsletterX columns means that the userid in the same row is subscribed to newsletter X.