I also think your typing style is a bit suspect if you manage to activate the trackpad whilst typing
Not if you're a trained typist, your hands are quite low, SWMBO (85wpm at her peak) has the bottom thumb joint of her hands about 5mm above the pad and she was always complaining about the cursor jumping about whilst typing, having found out how to to disable the pad the problem disappeared. Also the fact that the manufactures bother to provide an option to switch off the pad whilst typing says it all really. .