trackpad touch detect rule not enough

the trackpad touch rule has only leftmost x/y and rightmost x/y, but when my hands natuarly lay on the keyboard, my two palms are becoming the leftmost and righmost touch. If I want to trigger some actions by touching with my pointing finger while my palms are still there, this doesn't work. Because I the pointing finger touch is between leftmost and rightmost.

So I would like to have:

  1. add topmost x/y and bottommost x/y
  2. add settings to shrimp the active area of the trackpad (like don't take any touches outside the area into the rules) like karabiner does in its trackpad app