RealtimeKit and the audio problem

I thought perhaps there was a very small class of devices that might intuitively use such a flag - things dealing with UI (keyboard, mouse, audio) and so it might be feasible, but on looking at it I realize that firstly such a flag would be a terribly desktop-ish kind of thing to bake into the kernel, and additionally where do you draw the line? What if audio is streaming in over the network - does the BSD sockets API get the flag? Things start to break down very quickly. :)