Milter-greylist

The manpage for greylist.conf provides these two examples for dacl spamd
scoring:

              Example 1:

                spamdsock unix "/var/spamassassin/spamd.sock"
                racl whitelist default
                dacl greylist spamd

              Example 2:

                spamdsock inet "127.0.0.1:783"
                racl whitelist default
                dacl blacklist spamd > 15 msg "Your message is considered spam."
                dacl greylist  spamd > 10 delay 2h
                dacl greylist  spamd > 5  delay 1h

What I'd like to do is an additional delay to the standard tuple greylist
delay based on the score (say with dacl greylist spamd > 5 delay 30m) but
then after that point if the sender tries to send it again, go ahead and
pass it along with scoring information in the header to the recipient just
like it would if I were running a spamassassin only system.

Are there any other tips and tricks out there?