[Plugin: Exclude Plugins] Customise the list site-by-site

It is great being able to hide some plugins from *all* sites, making them available just to the super user. Is there any way to define what sites, on a site-by-site basis, to see or have plugins hidden from them?

For example, a network with ten sites may have one site requiring a custom plugin that none of the other sites should see or be able to activate. Can that be done? If not, is it a likely future enhancement? Or is there another way to do this, that I am mising?

— Jason