Matt, yes, your efforts on the IDCC board are certianly noticeable and appreciated. And, I agree that private boards are not the answer to the problem of censoring unwelcome crappers.
In the near future, it is probably worth everyone thinking about what would be a workable definition of a crapper as distinct from a naysayer. i.e. try to find out what the common tactics and content are in the garbage messages so you can codify them into the TOU or at least articulate them to brighten the line when action will be taken.