> This situation is very annoying, especially for a touch typist as my fingers are always on hjkl and my thumb on the spacebar. This makes my thumb knuckle constantly brush the trackpad and activate it.

I thought standard touch typing position was index fingers on the notches (f & j in US QWERTY). With that & some fairly large hands, the trackpad rests comfortably outside of my palm area? the trackpad seems pretty well-designed to just miss the palm in standard position.