Marketpress has a "product list" widget that allows you to create a list of products without thumbnail images (unchecking "Show Thumbnail"), but I can't figure out how to use shortcodes to do the same. Thought it would be as straightforward as to add an attribute like 'image="false"' (or image="0") to the mp_list_products shortcode. Doesn't work. And checking "No" for Show Thumbnail in the Presentation Product List Settings page does the job, but it ruins other pages I want product images in grid form. Can it be done with shortcode?