I was wondering if DH would consider adding an option to the junk filter preferences to disable the email subject modification. I, personally, don't find it to be of much use. My email client will "trust" SA headers. And even if it didn't I'd rather set up a rule based on the email header than on the subject.
Really, I just don't like seeing DHSPAM in the subject of message judged to be spam when I'm reviewing what's been caught.