MarketPress - No Shop On Primary Blog?

Hey Guys.

I'm looking to use your Marketplace plugin so that sub-sites on my install can run a shop, but I'm not needing/wanting a shop for the primary blog.

I see the plugin needs activated on the primary blog (which makes sense), and once activated that implements both the global shop features (MarketPress menu under Super Admin), and a local store feature for the primary blog (Products menu).

Is there any way to run this to allow shops for the sub-sites, without adding the individual shop taxonomy and functionality to the primary site?

It would seem to me this would be the way most people would want to implement this plugin who run a site hosting service using WPMU?

Thanks much!