Multisite, Easy Blogging, and ability to use other plugins


I am creating websites using multisite to manage them all plus I will be allowing free sites and paid upgrades using the Prosites plugin.

I would like to use the Easy Blogging plugin because it limits what a user can do, however, I also want them to be able to access plugins such as the Appointments plugin, e-Newsletter and a few others.

How can I make these options visible?

Also, is there a way to make only certain plugins available for individual sites?