No, but I could also implement that function Hellsatan. The only thing this hack could produce is spam. Say, for example, on your forum you have a advertisement section, where people can post threads about their website. Well, they could just send a PM through this hack to every member about that thread.
Although I might also think about an option via the User CP to not recieve forwarded posts...I'm not sure. Any suggestions you think would work good, let me know.