Why can't i individually activate Smart Crawl on a per site basis?

I would like to individually activate smart crawl pro plugin on a per site basis in my multisite wordpress set up, or activate the plugin based on levels...but I can't.

It seems i should have the option of doing it the way I want, or the option of network activation to take advantage of those network features you have created.

Why block individual site activation, what advantage does that create?

Can you suggest a workaround other than installing yeost?