Add Option to Not Store Email/Username in Drupal.

We have a request to not store personally identifiable info in Drupal. I see there is this code:

 if (!$drupal_user) {
      if (empty($userprofile->Email_value)) {
        $phoneid = isset($userprofile->PhoneId) ? $userprofile->PhoneId : $userprofile->ID;
        $userprofile->Email_value = $this->getRandomEmail($_SERVER['HTTP_HOST'], $phoneid);
      }

But I don't see a way to prevent the Email_value from appearing on the userprofile. It would be nice to be able to configure this in drupal.

Proposed solution:

Add a checkbox on the login radius settings "Don't save e-mail address in Drupal" which would trigger this code.