Infinite SEO + Pro Sites: Is it possible to restrict access to I.S. by the subscription level?

Like the title states, I'd like to provide access to Infinte SEO for only users of a certain subscription level. As is, once I.S. is active, it is activated across the network.

I realize this may actually require an update to the pro sites plugin itself, but if you could let me know if there is an alternative way to get this done, or could tell me if/when the pro sites plugin can be updated by your team I would greatly appreciate it.

Thanks.