Wow, simulated multi-touch! That would really rock. But how to tell the difference between this and two taps and a swipe? Maybe if there's 0 time between origin-release (thumb) and secondary-press (finger), you can go into simulated multi-touch mode. If there's even a fraction of a second between release and press, treat it as two taps. Is the touchscreen interface capable of that kind of fine-grained polling?