My default expression for Displace TOP Displace weight Y parameter is: me.par.displaceweightx*me.inputs[0].aspect — I do this since otherwise, working with non-square aspect ratios (and this is more apparent with ultrawide textures) the displace takes on a stretchy look (take a displace-feedback for example). I see this mistake quite often out in the wild too.
My suggestion is having a toggle to automatically aspect-correct the displacement (based on Resolution Source aspect ratio).
For reference:
Not aspect corrected (default, using same displace weight):
Aspect-corrected using above mentioned expression:
