[Plugin: Google XML Sitemaps] Shopp ecommerce plugin

I use the Shopp ecommerce plugin. To make xml sitemaps pick up products, someone wrote another plugin and now products appear. Problem is they don’t have urls, just product slug. Can’t find out how to put full url in those but the products are killing my google webmaster error log.

I see in XML Sitemaps you can add pages but since products build dynamically into a catalog or shopp category, I don’t know how to add them to this plugin. I don’t want to manually add every product individually.

Any ideas?

http://wordpress.org/extend/plugins/google-sitemap-generator/