Hi,
Just would love to know how to show all products on a single page. i want to have two menu buttons. With one : show all products and the second on is divides between several categories.
Since u can add multiple categories to your products, u can try to add all your products to a global category ( es. all_products) and to a specific category of your normal category tree.
Then just make a link on your joomla menu with a VM category and select the global one for show all the products.