My original post is just asking some package. With fuctions that pfSense has, can be developed much more like a transparent-proxy that filters samba with some antivirus like clamav done (ex)... Anyway, is right say that for security reasons is bad have a NAS server with Firewall in the "front" of connection. But, if the intention is use other features like QoS, CARP, and etc, is valid too if implemented like a "alternative" tool besides FreeNAS and pfSense. In this case has i said, is not to be used in "one" place, but can give other directions and more late turn FreeNAS more different of others. Fuctions that just pfSense can do and can be combined.
Sorry by the inconvenience of my post. OpenSource attempts respond needs of the market that will consume that like other product, however, with other "mind" and "voice", what is very good to all of us.