Sorry for necroposting but apparently it isn't working. I tried setting up a script call for fog2 and I even set the ox and oy coordinates and the fog name. Nothing showed up when I did it.
Acutally, I found out what happened. You get to see more than one fog only if you are using fog3 and fog4. However, is there a way to set the opacity and the zoom of a fog? Not only that but also change the fog types between normal, add and subtract? Any way how to do that?