I have multitouch working on the G1 in a way that is backwards- compatible with single-touch applications. I capture the multitouch events and then hijack an unused field in MotionEvent to pass the multitouch events in a way that only affects programs that have been designed to work in multitouch mode -- i.e. this did not require re- plumbing the event system. The approach also does not require any kernel modifications, it just needs modifications to one Java system class.
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