One of my feature sugguestions was a way for users to "alert" the admin to spam/advertising and abuse (via "Report Spam" or "Report Abuse") via a button on a PT; the resulting notice would show in the CP and when clicked the admin would get an overview of the PT so they could act accordingly on a case by case basis.
However, the general consensus was that it abused user privacy and people didn't want such a feature... Though if you ask me, it's no different than logging in as a user (via "become user") and looking at their PT's, only there would be some direction and only those topics with reported abuse would be viewable.
