As I said, no longer relevant.
No it won't. I already have that activated. It'd still mean manually redoing all thousand of them. The problem isn't to do with that. It's to do with the coordinates not making sense. I don't see a reason why I shouldn't be able to duplicate the regular coordinates exactly on the pixel by adding 1536 to the original X-coordinate sums of positions.txt. I don't want to "eyeball" similar results by re-doing the map. I want to go through the text-file and make it exactly the same. Not to mention it wouldn't actually be faster to use the "Nudge" tool, since it requires more cross-checking than just doing the math in the file itself with potentially worse results.
The Nudge tool only becomes relevant when making positions for the new provinces west of the line for the 1584 new pixels in this case, since those don't have original positions to begin with.
(FYI you activate it in the settings.txt file in My Documents/Paradox Interactive/CK2/ModName. But it doesn't support mods, so it'll be overwriting your vanilla positions.txt-file. Remember to switch that one out with your mod's, otherwise it doesn't do any good.)