In that case you can do it on you own if you need it (note that this is replacement for Sylius bundles not custom ones):

```php
list($config) = $this->configure($config, $container, self::CONFIGURE_LOADER | self::CONFIGURE_PARAMETERS | self::CONFIGURE_VALIDATORS);

$container->setParameter('my.own.namespace', array_merge($config['classes'], $container->getParameter('sylius.config.classes')));