Proxy server on PfSense that sends all traffic over an OpenVPN link?

[Dark Rayne]

Forgive me if this is an entirely stupid question, however:
Is it possible to set up a proxy server on pfSense that acts to forward all traffic it receives to an OpenVPN (client) connection.
Basically I want all normal traffic to go out the normal gateway and only some traffic to go out the VPN connection. I'm fairly sure most of what I need to go over the VPN connection is capable of using a proxy server. I did some searching on how to do this with firewall rules on pfSense and did not find anything usefull.