Somewhat important update to this script, I have decoupled the fog position from the game map in order to smooth out transitions on map connections. This also has the unintended side effect of allowing you to control the parallax of fogs now, the option FOG_PARALLAX
in config.rb
allows you to control the rate at which the fog scrolls with camera movement. The default value (1) gives the same scrolling behaviour as in an unmodified RPG Maker XP game.