\Route::set('admin.crud', 'admin/<config>(/<action>)', null, -2)
    ->defaults(array(
        'controller' => '\\Admin\\Controller',
        'action'     => 'index'
    ))->filter(function ($route, $params, $request) {
        $config = (array) \Kohana::$config->load($params['config']);

        if (isset($config['filter_route']) && is_callable($config['filter_route'])) {
            return call_user_func($config['filter_route'], $route, $params, $request, $config);
        }

        if (isset($config['controller'])) {
            $params['controller'] = $config['controller'];
        }

        return $params;
    });