This is a great piece of software, that I found thru your entry on the Google Pomodoro timer group. I also do crossfit -which makes use of a number of timers that this could be used for. So some suggestions:
1. Android / iPhone version.
2. Intervals as many as you can do.
3. Pre-timer countdown. For instance giving 10 second countdown and then a timer starts.
Every crossfit gym makes use of a timer of some sort and this might be an attractive program for them. You can read more at crossfit.com