CakePHP表单GET-Method URL

I want to create a DB-Entry with an create form.

controller/create/1

If the method is called without an ID, the Controller renders a different View (Step1) with a different form where the User has to Select an ID.

Now i want this form to call the given URL as shown above.

I tried in the view: $this->Form->create('...', array(

'type' => 'get'

but this gives me an URL like this:

controller/create/?id=5

Does anyone know how to adapt the URL?