I wouldn't be surprised if the double height of the Touch virtual res is to do with the touch, either to store an interaction map to map between, for faster key press effects, or as a mask. That said, the padding on that rows and the extra padding might also have something to do with holding touch data, maybe trying to skip bringing things out of a lower state until there's some actual processing to be done.
Be interesting to have a look at the mem referenced. Nice info tho.
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