Custom response types in CakePHP. Must have debug mode to less than 2 in order for it to work properly

app_controller.php

<?php
class AppController extends Controller {

/**
 * Setup the RequestHandler component
 *
 * @var array
 */
	var $components = array('RequestHandler');

/**
 * AppController::beforeFilter() gets triggered before
 * RequestHandler::startup(), which triggers RequestHandler::renderAs()
 *
 * @return void
 */
	function beforeFilter() {
		$this->_setupResponseTypes();
	}

/**
 * RequestHandler::respondAs() does not set a custom response type if debug
 * mode is set to 2 or higher, thus we need to set debug to 1 in order to
 * trigger the custom response types
 *
 * @return void
 */
	function _setupResponseTypes() {
		// Setup all the custom content-types,
		// extensions mapping to content-types
		$this->RequestHandler->setContent('plist', 'application/x-plist');

		if (!isset($this->params['url']['ext'])) {
			return;
		}

		if (!isset($this->RequestHandler->__requestContent[$this->params['url']['ext']])) {
			return;
		}

		if (Configure::read('debug') > 1) {
			Configure::write('debug', 1);
		}
	}

}

default.ctp

<?php // this is my app/views/layouts/plist/default.ctp ?>
<?php echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"; ?>
<?php echo "<!DOCTYPE plist SYSTEM \"file://localhost/System/Library/DTDs/PropertyList.dtd\">"; ?>
<plist version="1.0">
	<?php echo $content_for_layout; ?>
</plist>

posts_controller.php

<?php
class PostsController extends AppController {

	function test() {
	}

}

routes.php

<?php
	// This would work to support all extensions
	Router::parseExtensions();

	// You can also make it explicitly only support certain extensions:
	Router::parseExtensions('plist');

test.ctp

<?php // this is my app/views/posts/plist/test.ctp ?>
<dict>
	<key>Response</key>
	<string>Success</string>
</dict>