It would be great for us snow enthusiasts (and may be useful to the motorcyclists as well) to be able to separate functions for communications (left ear) and music (right ear). That way, we can more easily access some functions (forward/reverse track with rotating the right jog dial, increase/decrease volume with roatating the left). Also, you can get rid of the phone button (which is somewhat difficult to access with gloved hands) by integrating those functions into the "right jog dial push" function.
Two jog dials on the SPH10S! (Add a jog dial to the right earpiece.)