Steven,
If you are asking about saving the traffic from a given recording and then reusing it later to re-create a virtual service from that same recording file, then this is already supported and can be configured in the very first step of the Recording wizard.
In the first step you can you specify the location of the traffic file where the traffic from the recording will be saved. You will need to configure the "Export to" field:
It saves an XML file with all the traffic recorded and when you want to re-create a virtual service from the recording simply open up the recording wizard and specify the location of this XML file in the "Import traffic" field