I found a way to show non scrolling pictures. To do that, go to Sprite_Picture and change:
CODE
# Set transfer starting point
if @picture.origin == 0
self.ox = 0
self.oy = 0
else
self.ox = self.bitmap.width / 2
self.oy = self.bitmap.height / 2
And change it to :
CODE
# Set transfer starting point
if @picture.origin == 0
self.ox = $game_map.display_x / 4
self.oy = $game_map.display_y / 4
else
self.ox = self.bitmap.width / 2
self.oy = self.bitmap.height / 2
In this way, we can have fogs and light effects at the same time:

Credits: me xD
Extra Info:
- When you show a picture, you can set the display position as the upper left corner, or the center.
- This script makes all pictures that have their display position as the upper left follow the map, leaving all pictures with their display position in the center function as normal