[Dovecot] using procmail or some VDA with dovecot

[albi]

i'm running postfix+dovecot+mysql on FreeBSD 6.1, which has
dovecot-1.0.b7_1

i'd like to be able for each user to deliver all spam-tagged email (by
spamassassin) in a separate mailfolder

i've done some "googling" but find it hard to find a solution for this

has anyone a working setup with the above ?
can dovecot do this or should i find a solution via postfix ?

in the past i've used procmail (in a setup without mysql), but i've
just read that procmail is not meant to be used with virtual users

any hints ?
thanks in advance!

-- 
grtjs,
albi