You can, KIND OF have the three flash function. Signal, then press the button immediately - it will flash three times and self-cancel.

0-60 Freak - what a perfect stable. I had the pleasure of driving a GT3 just once, and within 50 yards, the steering feedback was revelatory (at the time, I was coming from an LP560, in which the steering feel was so dull compared to my previous e92 M3).