"Drop In"

I don't know if this is really where to I put this, but I would love for you guys to add a "Drop In" feature for server moderators, allowing them to listen to a voice channel without people knowing that they are in the channel. Ideally, this would be a permission under the roles settings. The reason for this feature is that if somebody is breaking server rules, and see that a moderator joins, they will most likely stop their behavior, and we will have no way of knowing whether they were breaking the rules or not.