add filter login_redirect does not contain original requested redirect

You can use login_redirect filter. See here http://codex.wordpress.org/Plugin_API/Filter_Reference/login_redirect

I think this is what you are looking for.

This will normally redirect all logins. To be able to redirect only when you want, you can use a query string parameter in the URL. Check for the parameter, if it exists redirect.

Try to add this in your template functions.php file:

add_action( 'login_form' , 'glue_login_redirect' );
function glue_login_redirect() {
    global $redirect_to;
    if (!isset($_GET['redirect_to'])) {
        $redirect_to = 'YOURURLHERE';
    }
    else{
        $redirect_to = $_GET['redirect_to'];
    }
}