Hi,
From what I understand, the best would be to add that parameter on the checkout and not on the cart or on all the pages.
What I would recommend to do is to take the URL of your checkout and create a menu item of the type "external URL" with that URL with the parameter rol=no added to it.
Then, in the "force menu on checkout" setting of the HikaShop configuration, select that menu item.
That way, when you arrive on the checkout from somewhere else, you'll have that parameter in the URL.
However, if you have a checkout on several pages, you'll have to also add that parameter in the form URL of the checkout page in the file "show" of the view "checkout" via the menu Display>Views.