Flex deployment - maintaining session information.

This relates to LDEV-987 Deployed .
Not sure if this is a bug or a configuration issue but two of the three applications we currently run in ACF9 require session information to be available for the logged in user. Our applications authentication take place through standard CFML pages and this information currently persists over to the Flex app when running on ACF9. Running Flex on Lucee is not providing us with the same session capabilities.
Ref:
Ben Forta's blogs about flex remoting back in 2006 / 2007 prompted me to look at the remoting between flex and cfc's as apparently flex should be aware of session information by default through AMF.
http://forta.com/blog/index.cfm/2006/9/24/Flex-And-Session-State-Management
http://www.forta.com/blog/index.cfm/2007/11/15/Flex-And-ColdFusion-Session-Variables

Michael Offner informs me that AMF is no longer used for this purpose and should be handled through BrokerServlet / MessageBrokerServlet. I can't find any configuration information on this. Perhaps this is a bug and should just work without any further configuration?