如何使Zend_Controller_Router默认重置不需要的参数

I'm using Zend-Framework 1.9.5 to make a web-application, But it's Url_Helper was quite tricky to me in the matter of parameter reset!, I know it's a good feature (parameter preserving) but in most cases I don't need it!. So I'm thinking of overriding the default Router to force it loosing parameters Unless I ask for it or maybe specifying a certain parameters that it keeps like (lang, or something like that).I'm using Zend-Framework 1.9.5 to make a web-ap