Ingame PM system for mods or report system

We already discussed this about PM's, but what if we at least could just PM mods in game. Most users doesn't use the forum. Imagine if we had a report system where we could save replays of matches. and then have a button that would let us send it to all the mods. Everytime the mods log in they would get a message where they are asked to check the replays so they can see it in action. To prevent spammers from abusing this you would have to wait a time before being able to report again. Any ideas how to prevent trolls from sending replays with just random content?