I don't know about you, but the first time I same the 'example' demo, the little boy in me wanted to drive that track-thingy. A few simple changes to the code and that's what you've got here.
For some reason, once in a while the arrow-keys will stop responding but a 'R' for restart brings things back around. Enjoy!
Check out some of my lightning photos while you're here, if you like.