Howdy! No, moving the camera in IR never caused displacement to be recalculated when set to screen space. Perhaps it's just more obvious in your current scene :) We actually use this to demo how screen space works, by starting IR, then moving the camera elsewhere, to show that displacement is done at increasingly less detail outside the initial view. Of course, it gets recalculated if you adjust the displacement settings though.
Glad you like the new sky model, got to admit it's awesome having been playing with it!