Virtual Email Appliance - "Email Password List" Configuration Sync

We are in the process of evaluating the Virtual Email Appliance at the moment, and we have a requirement to provision the "Email Password List" (ie. email address and password for Web Quarantine Access) programmatically.

We can provision the users manually, in comma separated format, via the web interface in the “Email Password List” area.  This is not a scalable solution for us however, as we have 5,000+ users who change frequently and all require Web Quarantine Access. I understand that you can use directory services to authenticate users to the Web Quarantine, however this is not possible in our environment for a number of reasons.

We are able to provision mail routing and other such settings programmatically using the supported Configuration Sync functions (http://sea.sophos.com/docs/esa/sea_docs/en/ESA/concepts/SCPSyncOverview.html) and I was hoping we could use the same methodology to provision the “Email Password List”.

Any assistance would be greatly appreciated as the product looks fantastic and we are keen to transition across, however this is a show stopper for us and we would not be able to implement unless we can automate this function.

Thanks

Matt