Make it possible for users to create an account w/o asking for their information

Most sites that use Facebook Connect as a login method don't require that users input account information specifically for that site. For usability reasons, it would be great if the fbconnect module let people create a functioning account without asking for a separate Drupal username and password. Here's some rough code to do this:

function fbconnect_register_page() {
  global $user;
 if (($fbuid = fbconnect_get_fbuid()) && !$user->uid) {   
   switch (arg(2)) {
     case 'import':
     case 'create':
	$fbuid = fbconnect_get_fbuid();
 	$name = fbconnect_get_fbname($fbuid);
	$fb_return = facebook_client()->api_client->users_getInfo($fbuid, array('proxied_email')); // (http://wiki.developers.facebook.com/index.php/Proxied_Email)
	$mail = $fb_return[0]['proxied_email'];
$user_default = array('name' => $name, // function gets this from Facebook
							'pass' => user_password(),
							'init' => $mail, // init is email address
							'status' => 1,
							'mail' => $mail, // function gets this from Faceboo  
							);
		$user_default['roles'][DRUPAL_AUTHENTICATED_RID] = 'authenticated user';
		$account = user_save('', $user_default);
		watchdog('fbconnect', t('New user: %name %email.', array('%name' => $name, '%email' => '<'. $mail .'>')), WATCHDOG_NOTICE, l(t('edit'), 'user/'. $account->uid .'/edit'));
		$user = user_load(array('name' => fbconnect_get_fbname($fbuid)));
		fbconnect_register($user->uid, $fbuid);
		$output .= "Registration complete.";
		return $output; 
   }    
   return $output;
 }
}

Note that in order for the mail (& init) fields to get saved correctly the users table would have to be modified so those fields are varchar(255) or something close to that. Unfortunately, Facebook's proxied emails are extremely long strings. If anyone knows of a way to get the user's real email address (such as taking it from the Login to Facebook popup window), that would be much better.

Also, this code seems to perform poorly & doesn't do any validation to make sure that there isn't already a user with this info. Suggestions for improvement would be greatly appreciated.