1. A fix for seeking on startup; fix is described here: http://forums.adobe.com/thread/1054095 - one caveat specific to HLS is if your streamtype is set to liveOrRecorded, it won't work correctly (need to dig into this more)
2. A fix for 404 not found on .ts segments; debatable if this should be fixed?  Some URLs seems to contain missing .ts segments, and the stream can basically play on even given they're missing, but it seems a little silly to humor this sort of thing client side.