Yes Lewis, Y move is very useful, and for compatibility too can't simply fix the actual P rotation modifing the code, or all the old projects will render different and the Y move will disappear.
At this point better simply modify, in the node panel, the words "Pitch rotation" with "Y move", so nothing change in the rendering when open an old scene, and ADD a new feature (the right P rotation). Something like in the image I attach (of course the 2 rotations must be near, one after the other and Y move must be the last, but to make you understand what I mean with change only the words and not how works the node).
Lewis wrote:Yes it is correct that Pitch rotation actually just moves environment -/+ Y currently but i had good use of that for moving HDRIs black ground slightly down to compensate on higher camera angles and not get black horizon. So although it should be fixed i'd like then that we have new feature called transform X/Y so we still can achieve that effect all around whole HDRI and not just P angle 'coz if it goes to proper Pitch rotation then one end will dip down while other will go up and we will get HDRI balck/grounds visible on reflections on the other side of render....
P.S. Same behavior happens in Physical SKY HDRI input pin.
cheers