What do the graphic options Terrain Texture and World Detail do? I took a screenshot with both at minimum, then setted both to max, closed game completely and reopened (and checked that both are still at max), and took another screenshot. I didn't see any difference at all...
Only Texture detail seems to make any difference - all the trees, rocks etc are much more detailed with texture detail raised. But these 2 don't seem to make any difference.