function theme_views_display_filters_cases_open($view) {
  $form = views_filters_form($view);
  // filter1 or filter2 or filter3 depending on which filter you need
  $options = $form['filter0']['#options'];

  // ... code to remove options you don't want ...
  // example

  $roles = user_roles(1, 'set case status')
  $allowed = array();
  foreach ($roles as $role) {
    $sql1 = "SELECT rid FROM {roles} WHERE name = $role";
	$result1 = db_query($sql1);
	$rid = db_fetch_object($result1);
    $sql2 = "SELECT u.name FROM {users} u INNER JOIN {users_roles} ur ON u.uid=ur.uid WHERE ur.name = $rid";
	$result2 = db_query($sql2);
	$users = db_fetch_array($result2);
	$allowed = array_merge($allowed, $users);
  }

  if (count($allowed) < 1) {
    return false;
  }

  foreach ($options as $option => $text) {
    if (!in_array($option, array('page', 'blog', 'story'))) {
      unset($options[$option]);
    }
  }
  $form['filter0']['#options'] = $options;
  return drupal_get_form("views_filters_$view->name", $form, 'views_filters');
}