Yes it's possible and it's pretty complicated. You have to start the MapPage object at 3x normal width before EQ2 loads the first map, then set it back to normal width the first time the map window is opened. This also displaces your location arrow so that you don't see it either. The lack of location arrow (until you've zoned) and the particular order in which the map window must be opened and it's state upon camping is why we abandoned making it a standard feature. Plus I imagine the EQ2 devs don't really like the players getting rid of the fog.