function mymodule_form_alter(&$form, $form_state, $form_id) {
  if ($form_id == 'views_ui_edit_form')
  {
        $other = &$form['displays']['settings']['settings_content']['tab_content']['details']['columns']['third']['collapse']['other'];
        $other['custom']['#theme'] = 'views_ui_display_tab_setting';
        $other['custom']['#description'] = 'Custom';
        $other['custom']['#link'] = '<a href="' .  base_path() . '/node/1" title="Get information on how to theme this display" id="views-page-1-custom">Custom</a>';

  }

}

['displays']['settings']['settings_content']['tab_content']['details']['columns']['third']['collapse']['other']

/**
 * Implements hook_views_api().
 */
function mymodule_views_api() {
  return array(
    'api' => 3,
    'path' => drupal_get_path('module', 'mymodule'),
  );
}

/**
* Implements hook_views_plugins().
 */
function mymodule_views_plugins() {
  $path = drupal_get_path('module', 'my_module');
  $plugins = array();

  $plugins['display_extender'] = array(
    'mymodule' => array(
      'title' => t('Some Setting'),
      'help' => t('A description of the setting.'),
      'path' => $path,
      'handler' => 'mymodule_views_plugin_display_extender',
    ),
  );

  return $plugins;
}

class mymodule_views_plugin_display_extender extends views_plugin_display_extender {
  /**
   * Provide a form to edit options for this plugin.
   */
  function options_definition_alter(&$options) {
    $options['my_setting'] = array(
      'default' => 0,
    );
  }

  /**
   * Provide a form to edit options for this plugin.
   */
  function options_form(&$form, &$form_state) {
      parent::options_form($form, $form_state);

      if ($form_state['section'] === 'mymodule') {
        $form['my_setting'] = array(
          '#type' => 'checkbox',
          '#title' => t('Some Setting'),
          '#description' => t('A sample checkbox.'),
          '#default_value' => $this->display->get_option('my_setting'),
        );
      }
  }

  /**
   * Handle any special handling on the validate form.
   */
  function options_submit(&$form, &$form_state) {
    $this->display->set_option('my_setting', $form_state['values']['my_setting']);
  }

  /**
   * Provide the default summary for options in the views UI.
   *
   * This output is returned as an array.
   */
  function options_summary(&$categories, &$options) {
    $options['mymodule'] = array(
      'category' => 'other',
      'title' => t('Some Setting'),
      'value' => ($this->display->get_option('my_setting')) ? 'Yes' : 'No',
      'desc' => t('Set a setting.'),
    );
  }

}

name = My Module
description = Sample views display extender
core = 7.x
version = 7.x-1.0

dependencies[] = views

files[] = mymodule.views.inc
files[] = mymodule_views_plugin_display_extender.inc

$view->display_handler->get_option('my_setting');

/**
 * Implements hook_views_post_execute().
 */
function mymodule_views_post_execute(&$view) {
  $my_setting = $view->display_handler->get_option('my_setting');
}