Well, we have the activity page, which is basically the web UI version of the limelm.pkey.activity web API function.
You can also find that link on the main Dashboard page (the "Account activity" link on the right hand side of the main dashboard after you login to your account).
I understand what you're actually trying to do is to "dig into" the history of the activations for a product key without leaving the page. Like a "show history" link that dynamically retrieves the historical activations / deactivations. We're working on that.