The main issue I had with “absolute” positioning was that I would make an adjustment to the AF point - say, move it to the lower left portion of the screen. But when I then tap the right portion of the screen to begin dragging it back, it “jumps” to that area. Which is fine if by design. Also, you have to complete the AF move with one swipe or it will “jump” back. I think I prefer relative, but they really need to address the lag issue when using it. Also, the ability to control speed of movement, much like a computer mouse on a monitor, would be nice.'Touch and drag AF' active touch area is set to full screen - this gets rid of the horrible lag you get when you use part of the screen (when set to 'relative').
'Touch and drag AF' positioning method is set to relative - with absolute, I needed to release (a suitable) grip on the camera while moving the AF point to the left.