$_REQUEST accessor function

There is
$this->request->get['']
and
$this->request->post['']

but often I find APIs that require the $_REQUEST method

For now I've just been using the raw version
$order_id = $_REQUEST['order_id'];

Could/Should this be added to the request library:
$this->request->request[''];

$_REQUEST can mix stuff up.

I'm sure you know request is mix of $_GET, $_POST, $_COOKIE.

Well i know its a mix of the first 2.. but sometimes its only important to acquire the returned content.. regardless of method.