I completed all the courses by wasting opponents, and decided to redo all tracks winning by killing all the peds.
I managed to kill 515 of the 516 on the first track, and the final ped can't be killed. If I drive through him he takes no damage, and the electro rays don't trigger for him (I'm in the electric car).
I tired taking a screen capture, but just as I was maneuvering into position, the last opponent managed to kill himself by ramming into me as all the others had done... And I'd even downgraded my offensive upgrades all the way to avoid that.
The strange thing is I seem to remember this as a bug from the original release all those years ago...
Anyway, apart form this bug, it's a great game - I'm surprised how well the controls work on the touch screen once I got used to it - the car handling, with all the handbrake turns etc., is one of the things that made the game so great.