silverstripe-cms/code/controllers/CMSSettingsController.php

<?php
class CMSSettingsController extends CMSMain {

	static $url_segment = 'settings';
	static $url_rule = '/$Action/$ID/$OtherID';
	static $menu_priority = -1;
	static $menu_title = 'Settings';
	
	function getEditForm($id = null, $fields = null) {
		return $this->RootForm();
	}
	
	function PreviewLink() {
		return false;
	}

	function Breadcrumbs() {
		return new ArrayList(array(
			new ArrayData(array(
				'Title' => $this->SectionTitle(),
				'Link' => false
			))
		));
	}
	
}