Ohh thank you for that answer! I would've spent more hours on trying to solve the problem. I guess I thought I might be able to pre-process by adding the aspnet_isapi.dll to the Executable (optional) box in the iis7 module mapping for PlayListHandler. The other thought was changing the handler mapping order etc... So the answer is it just will not work until you expose an API in CTP2. Thank You!
If I understand your last statement then it will be similar to modifying the server-side playlist server object in memory? That would be really cool to modify a memory playlist in realtime based upon user key, especially if you could fire an event to re-read the client side instantly in response. I'd also love to be able add/modify/delete header markers as well. Will we still be able to use the ASP.NET State server then for load balancing (as in CTP1)? Thanks for the clarification..I'm looking forward to CTP2.