Regex filters => Bayesian tokens?

[pna.lists]

> > Which is the easiest way to convert the results of checking the e-mail
> > using several regex filters into additional Bayesian tokens?
> >
> > The SpamAssassin rules
> > (http://spamassassin.apache.org/tests_3_1_x.html) and the rulesets at
> > http://www.rulesemporium.com/rules.htm are useful, but the traditional
> > SpamAssassin fixed cumulative score approach leads to false positives.
>
> Add an x-header for each regex filter.

Is anybody utilizing bogofilter to analyze the x-headers written by
SpamAssassin or ASSP running as the e-mail relay?