This is exactly the reason I'd like to see the "beep" replaced by a generic
keyclick. The point is to indicate to the user that their keypress has been
recognised.

I put a patch up at http://www.rockbox.org/tracker/task/7307, but it needs
resyncing.

There didn't seem to be much interest it the idea at the time (i.e. it's
felt worth committing), but I'll revisit if others think it's useful. I
certainly do!

I suspect that stopping playback to improve perceived responsiveness
probably wouldn't respond as quickly as you'd like anyway.

-- 
pondlife