What would be very useful is something like
SmartGUI Creator , if I'm creating an AHK GUI I can open an existing script.ahk and I can drag the buttons/elements one at a time or move them all down a bit or over a bit in one go without having to re-type ALL the x,y's.
Maybe you could have a plugin for Notepad++ to add/subtract so much to the x and/or y's in the highlighted section of the script ???