Drupal自定义注册表单保存

我编写了一个自定义模块，在用户注册表单之前添加一个简单的表单步骤 . 我有以下内容，在注册表单中添加了一些自定义文件

function join_form_form_alter(&$form, &$form_state, $form_id) {
    if ($form_id == 'user_register_form') {
         //lots of extra fields
    }
}

我还创建了一个安装脚本来在DB中创建一个新表，这样我就不必弄乱默认用户表了 . 目前一切正常，除了将自定义数据保存到我的新表 .

这是我的自定义提交功能

function join_form_form_submit($form, &$form_state) {

    $form_id = $form_state['input']['form_id'];

    switch($form_id) {
        case 'join_form_form':
            //
            break;
        case 'user_register_form':
            $date = new DateTime();
            $data = array(
                'username' => $form_state['values']['name'],
                'email' => $form_state['values']['mail'],
                'title' => $form_state['values']['title'],
                'first_name' => $form_state['values']['first_name'],
                'last_name' => $form_state['values']['last_name'],
                'gender' => $form_state['values']['gender'],
                'dob' => $form_state['values']['dob'],
                'address_1' => $form_state['values']['address_1'],
                'address_2' => $form_state['values']['address_2'],
                'address_3' => $form_state['values']['address_3'],
                'country' => $form_state['values']['country'],
                'county_state' => $form_state['values']['county_state'],
                'postcode' => $form_state['values']['postcode'],
                'contact_pref' => $form_state['values']['contact'],
                'created' => $date->format('Y-m-d H:i:s')
            );

            user_save(drupal_anonymous_user(), $data);

            drupal_set_message(t('Good here.'));

            db_insert('registrations')
            ->fields(array(
                'title' => $form_state['values']['title'],
                'first_name' => $form_state['values']['first_name'],
                'last_name' => $form_state['values']['last_name'],
                'gender' => $form_state['values']['gender'],
                'dob' => $form_state['values']['dob'],
                'address_1' => $form_state['values']['address_1'],
                'address_2' => $form_state['values']['address_2'],
                'address_3' => $form_state['values']['address_3'],
                'country' => $form_state['values']['country'],
                'county_state' => $form_state['values']['county_state'],
                'postcode' => $form_state['values']['postcode'],
                'contact_pref' => $form_state['values']['contact'],
                'created' => $date->format('Y-m-d H:i:s')
            ))->execute();

            //empty session data
            unset($_SESSION['name']);
            unset($_SESSION['email']);

            break;
    }
}

是否可以覆盖默认的reg进程以正常保存用户，然后将数据保存到我的自定义表中，然后定义重定向？我正朝着正确的方向前进吗？