Outbound policy - ability to use DSCP markings on traffic

I couldnt find a previous request but this comes up for SAS at the moment, we have customers running workstation apps like Skype/Jabber which pre-mark traffic with DSCP tags, fine for the QoS rules but in the outbound policy I can see no way to pickup on DSCP to force traffic down a sub tunnel for example (tunnel A for data, tunnel B for voice with FEC or WAN smoothing enabled)

I can see it would be a very useful feature as most voice and video is pre-tagged now.