FWIW, there's another source of info that might be used: jitter.
When you have two fingers pressed, not only the reported position is
more-or-less the middle point, but it's also jittery.
So you could detect such jitter as a tell-tale of "multitouch" and then
use the jitter itself (orientation and magnitude) as an indicator of the
actual position of the fingers. Whether it would be sufficiently
reliable to be used, I don't know.
Stefan
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