zBrush Displacement Midpoints?

3D4Eva

I was watching a video from Flippednormals and they were going over midpoints for displacement maps. I was always told before when using 16bit tiff to use 0.5 as the midpoint and when using a 32bit exr to use 0 as the midpoint, but that video was talking about values like -1 and even 1 if python was involved. I have zero idea what that means... is there any reason to use -1 or 1 as your midpoint from zBrush?