Well, it is possibly to write another function based on the function that generates the “[dpsc_display_product]” shortcode.
However, what happens when you put in this shortcode in your custom post types? Theoretically, it should work perfectly. The only thing that would be missing would be the product details meta box (for defining the price, etc).
But you can go around that by using custom fields directly – please see: http://dukapress.org/docs/custom-fields-used/
As for the “grid display” shortcode, it actually takes a parameter to define the post type so no problem there 🙂 See: http://dukapress.org/docs/short-codes/
