Tokens including header values?

[Chris Wilkes]

This spam got past bogofilter today, the -bfvvv one is the result of a
running it through bogofilter -vvv after registering it as spam:
	http://ladro.com/bf/20020131-01.txt
	http://ladro.com/bf/20020131-01-bfvvv.txt

As you can see there isn't much there to go off of, the main words I
could that show it to be spam are:
  alice deflowered hymen's
Which aren't likely to show up in another spam email.  Nor is the
website, kellu.com.  They'll just change it to be kellv.com next time.

However I have seen quite a lot of spams with my email address in the
Subject line:
	Subject: See her get deflowered cwilkes at pobox.com
Hardly anyone that's going to email me puts my email address in the
subject.

Likewise, I'm never going to get legitimate email with a bunch of other
cwilkes's listed in the To:.

Has anyone thought of making bogofilter header and body aware?  I'm not
sure how much of a gain that would be versus making the code that much
more complicated.  You could write out to files like spamlist-subject.db
and goodlist-to.db.

Chris