Since the Clip+ is great for working out, some functions would be very very helpful and should be simple to implement.
A clock display. This could be a separate option, or appearing always during music playback.
Timer, stopwatch, countdown functions. For athletic activities. Including alarm beep. How about doing a 10 minute run on the tredmill and have the Clip+ count and beep for you when the time’s up?
A more advanced funtion would include a lap/interval timer.
(just copy the basic functions of a sports watch)
This should all be possible with simultaneous music playback.