Extending the Users section of the admin panel Is it possible to add additional tab views that aren't related to user fields?

We would like to show a summary of user account activity that includes details of purchases they have made. A plugin would work obviously but we would want all of this information in the existing user area rather than in a new area for the plugin.
Right now you're best bet is going to be with a plugin that has its own, separate section for displaying the purchase information.