Admin only access for plugins and themes inPro-sitesn

Hello All,
I have plugins and themes I want to activate that only I can use in the main site and not all the other blogs.
It would be good to be able to give specify Super-Admin access only to some of those.
Maybe a access level could be created that could be set to admin only and then that could be where these plugins could be assigned.
Or maybe a way in the plugin area to assign them to admin only.
Wishful thinking for sure.

Just thinking out loud, and as you can tell it might be way too early in the morning for that.

Thanks again for all you do.