This is the opposite of what I want. Is there a fix for the defectively-large trackpad on Mac laptops, which causes spurious right-clicks, deselections, and cursor jumps while you're typing?

The fix would be to deactivate the outer inch or so of the trackpad.

I can only imagine the overly-complicated and ultimately unreliable touch-rejection logic Apple has ladled onto this thing, to work around a problem they created.