I'm also interested about this. Instead of referring to the "master" source HLS and adaptive Flash urls in my wowza cloud live session player, could I create a player that is forced to fetch the stream from the named nearest geographical edge hub/delivery point with a specific URL/IP?
This would be a case for example in a corporate intranet that uses some distant proxies to mediate the internet traffic. There a distant proxy would probably give a not so good source stream if it is optimised by the proxy location, instead of the nearest geographical location.
If possible, would be good to know the edge locations and the instructions how to build the customised stream URLs.