How can I configure the cbpolicyd SPF module (Zimbra 8.0.3, Ubuntu 10.04 LTS) to allow mail tagged with PermError?

As much as I would like to punish the bad mail admins it's starting to aggravate our users that some legitimate mails is being blocked. I saw that Ubuntu's implementation allows you to modify the PermError_reject setting. Ubuntu Manpage: python-policyd-spf - pure-Python Postfix policy daemon for SPF checking