silverstripe-framework: Deal with CSRF errors in a user friendly way

When you submit a form and then copy the URL and send it to someone … they get this horrible message:

There seems to have been a technical problem. Please click the back button, refresh your browser, and try again.

Which is wrong and useless.

I wonder if we can add something like this to the controller (PSEUDO CODE)

        if($this->request->param("Action") == $nameOfForm && !isset($_POST["SecurityID"])) {
            return $this->redirect($this->Link());
        }