Community Builder will substitute the default Joomla login/register methods. But will it synchronize the profile fields with the Virtuemart 2 ones, so the user will automatically become a shopper with all the user information copied? Also will CB work with jNews, an application for newsletter subscription that automatically takes the new users?
I thought of a hack but I don't know if how can be done or how "easy" it is... Somewhere in VM2 there is a code that "grabs" the basic info of a user (username, email, password) and creates the shopper. If, somehow, we told it to grab some other certain fields? Just a thought...