May I ask how you'd accomplish this without ruining the integrity of the system as a whole? I can see adding points to give people more stuff, but then you'd not be able to use it as an infraction system. Correct?
I was also thinking of using this as a positive system. But you have to better integrate it with the like system.
I also believe reading as a moderator through each message and having a "warn" link under each message does no good. It would be far better to have a neutral "more..." link where all these things are triggered.