Discover reputation trade
 

If reputation is the basis of your forum promotions, like it is on mine, then reputation trade will most likely be happening. Allowing members to seize a higher member status than should be. This can be discovered by comparing if the same members are giving each other ratings within a certain time frame. This is a monks task within the current reputation system. If someone would write a mod which would put ratings which are exchanged (within say a week) in a moderation que, this would be very handy.

It would still be an awesome modification to:

cause an alert by PM or post if more than X% of reputation given is to the same person.