Hi Andy,
This is a topic near and dear to me - I think the short answer is "not quite yet". AFCS, especially the client library, was born with 2 goals :
1. Make it so easy to build collaborative apps that most Flex devs can do it.
2. Lead a sea change, following from 1), which helps define what real-time collaborative workflows on the web can be.
I think it's safe to say we're still tightly focused on 1). We're moving towards commercial release, and are doing all the things it takes to get us there (most of which involves e-commerce systems). But we haven't forgotten 2). Some of the initial gestures/workflows we think are important are already included in the UI SDK, like ShareCursorPanes, WhiteBoards, and Chat. But we know there's still some distance to go. We believe the richness of the Flash Platform is a perfect vehicle to evolve multi-user UI, and devs who use our platform tend to be well-suited for this kind of thing.
So that's the long answer - we're definitely planning on diving deeper into pattern design for this sort of thing, but at the moment it's about executing the core, enabling tech.
hope that helps
nigel