Passively monitor (but not store for more than say, 10 games) length of games in terms of actual seconds: if there is a trend of short ones, start logging game length, and win ratio as well. A perfect 50/50 or a highly disproportionate ratio would lead to an automatic notification of all staff/gms/whoever you want. (More advanced scripts might scramble it up to avoid an incriminating ratio, so a staff ability to look in a server without showing up in the queue would also be very useful).

Shared.