[tor-users] transparent proxy on FreeBSD

Hi

I want to setup transparent proxy over tor network on FreeBSD using ipfw because its native to FreeBSD.Tor's wiki about transparent proxy says that only PF is supported but in manual it's written in TransProxyType option's description: set this option to "ipfw" to use FreeBSD ipfw interface. I couldn't find any information or tutorial about how to setup local redirection through tor using ipfw. Is it possible achieve what I want? Is FreeBSD ipfw interface feature in working state or its still developed?