Define/set shipping plugins for MarketPress as WPMU Network admin

I love MarketPress 2.8 and the continued improvements. WIth the inclusion of new shipping plugins, I would like to ask for a feature that allows the network admin (me) to define which shipping plugins can be used.

I have a series of apps that require only a few particular shipping settings. So, I must empty (delete) contents of shipping plugin files I cannot use in my apps.

Therefore, I wonder if it is possible (like with payment gateways) that I could set which shipping plugins I allow for use by my site admins.

Thanks - keep up the good work!