'checkboxes' process function from other modules are disabled by select_or_other

Line 104, select_or_other.module:

  if ($element['#select_type'] == 'checkboxes') {
    $element['select']['#process'] = array('select_or_other_expand_checkboxes');
  }

This kills all process functions defined by hook_elemens() from other modules. I have this:

function multicolumncheckboxesradios_elements() {
  return array(
    'checkboxes' => array(
      '#multicolumn' => FALSE,
      '#process' => array('multicolumncheckboxesradios_element_process'),
    ),

}

but because of line 104, my process function is no longer called. Should remove line 104 and do something like this:

function select_or_other_elements() {
  return array(
    'checkboxes' => array(
      '#multicolumn' => FALSE,
      '#process' => array('select_or_other_expand_checkboxes'),
    ),
}

function select_or_other_expand_checkboxes($element) {
  if ($element IS CREATED BY SELECT_OR_OTHER) {
    foreach (element_children($element) as $key) {
      $element[$key]['#return_value'] = check_plain($element[$key]['#return_value']);
      $element[$key]['#name'] = $element['#name'] . '[' . $element[$key]['#return_value'] . ']';
      $element[$key]['#value_callback'] = 'select_or_other_checkbox_value';
      $element[$key]['#pre_render'][] = 'select_or_other_checkbox_prerender';
    }
  }
  return $element;
}