Marketpress listing featured products from network


I have Marketpress installed on my network and would like to be able to feature products from different user's stores. I can obviously html this list of products together, but I'd much rather use a global shortcode or global shortcodes. I thought about having a special tag or category for the featured products and simply tagging them myself, but I can't figure out a way to restrict certain tags and/or categories to the network admin's use only.

All that to say, is there an easy way to shortcode single, specific, network admin chosen products from the network? Or better yet could the network admin create a featured listing somehow?