When coming across a spammer who is barraging, you need only report one of the posts. Our common practice is to ban the user once they've been reported, then do a post search and delete everything that comes up.
More over, we now have a system in place that allows any active moderator to see any reported post notification, regardless of what forum it was reported in.
So, like I said, you needn't work any harder than reporting one of the posts.