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I've noticed in my few days with a modbook that the jumping cursor problem (while caused by interference) is isolated to the top left corner, but not entirely including the Apple menu. I've also noticed that the error behaves identically to stylus movement in that the cursor skips immediately from point A to point B, then hover clicks. Might we, by means of a script, be able to disable input in the menu bar from the left third of the Apple menu to the left corner, thus forcing the ignorance of erroneous input?
My belief is that preventing natural cursor input in that area (without diminishing usability) would also block the artificial and erroneous input because they are perceived identically by the digitiser board.