exactly, why not leave H.264/nellymose/whatever module as a stub in the code, then open source the rest. I am pretty sure a third party custom build can come up

exactly, why not leave H.264/nellymose/whatever module as a stub in the code, then open source the rest. I am pretty sure a third party custom build can come up with using alternative technologies. But I doubt they are willing to open source their pixel blender in Flash 10 though.