I am no expert in php but I do know some stuff. So here is my idea if it sounds plausible hopefully Envato staff can hire the right guy to do it.
Step One – Lets log http header referrals to a MySQL Database with php
Step Two: Lets create a filter or a bad word class using RegEX.
This will allow us to find bad refers think of it as a bad word filter
Step Three: If the filter is triggered update a MySQL table to 1.
Lets say if your database has a table field called bad. By default make it null or 0. You could also do a email but maybe that wouldn’t be optimal.
Step Four: Cron Jobs. Maybe make a daily log file (only bad ones). You can call the files refer_log_03062010.cgi
What you think?