The Feedburner stats package comes from Blogbeat, which was acquired by Feedburner earlier this year.
For foundry account folders, it is still not possible to activate the service en masse.
As you may recall from my previous post about Feedburner, I like it when they apply API to their services. When asked whether Site Stats has API, Rick Klau said:
<cue rel="standard response">Not at this time, no</cue>
<cue rel="forwardLookingStatement">stay tuned</cue>
I am staying tuned.