Newsletter vocabulary hook_form_alter() restricts functionality

In simplenews.module around line 497 the following code is causing problems for me...

if ($form_id == 'taxonomy_form_vocabulary' && isset($form['vid']) && $form['vid']['#value'] == $vid) {
    // Hide critical options from newsletter vocabulary.
    $form['help_simplenews_vocab'] = array(
      '#value' => t('This is the designated simplenews vocabulary.'),
      '#weight' => -1,
    );
    // We display the current content type settings in a disabled form element
    // to the user. The real value passed in the form separately because
    // disabled elements do not get saved at submit.
    $form['content_types']['display_only'] = $form['content_types']['nodes'];
    $form['content_types']['display_only']['#disabled'] = TRUE;
    $form['content_types']['display_only']['#description'] = t('These content type(s) are used as newsletter. They can be set in !simplenews_settings.', array('!simplenews_settings' => l('Simplenews settings', 'admin/settings/simplenews')));
    $form['content_types']['nodes'] = array(
      '#type' => 'value',
      '#value' => $form['content_types']['nodes']['#default_value'],
    );
    // Free tagging can not be allowed see: simplenews_validate_taxonomy().
    $form['settings']['tags'] = array('#type' => 'value', '#value' => FALSE);
    // Multiple select does not work with simplenews.
    $form['settings']['multiple'] = array('#type' => 'value', '#value' => FALSE);
    $form['settings']['required'] = array('#type' => 'value', '#value' => TRUE);
  }

Basically, I am trying to apply the same vocabulary to many node types so that content of different types that talk about the same subject can be within 1 list. The code above denies me the ability to apply the same vocabulary to any other content type apart from newsletter which restricts functionality. Is there not a better way of doing this?

thanks
Will