factories.ymlの値を取得

factories.yml

all:
  routing:
    class: sfPatternRouting
    param:
      generate_shortest_url:            true
      extra_parameters_as_query_string: true
      suffix:                           .html

  request:
    class: sfWebRequest
    param:
      relative_url_root: "/mobile"

特定applicationの設定は以下で取得できました

$config = sfFactoryConfigHandler::getConfiguration(array(sfConfig::get('sf_apps_dir').'/'.$application.'/config/factories.yml'));

$config['routing']['param']['suffix'];
$config['request']['param']['relative_url_root'];

現在の設定を取るだけなら以下で可能

$options = sfContext::getInstance()->getRouting()->getOptions();
$options['suffix'];
sfContext::getInstance()->getRequest()->getRelativeUrlRoot();

[version 1.4.9]