I've got an idea.
In my trainings schedule I've got to do exercises, every exercise for a certain amount of seconds.
Doing my exercises and looking at my stopwatch at the same time is quite a burden so if you ask me it would be nice to set a number of seconds, and for every time time these seconds have passed, the n900 beeps.

So for instance, I want to do explosive push ups for 10 seconds.
I set the stopwatch app to beep every 10 seconds.
When I want to do another exercise, I set the time to 30 seconds and after every 30 seconds the Nokia beeps.

You think this is a good and possible addition, or you think it's ridiculous?