Oh man, does it have a way to set the fog to different density in different areas? Vanilla's max draw distance seems way too low in the relatively-nice parts of the island, especially the South, West, and coastal East, but if you set OpenMW's draw high enough to feel right in those areas, it's way too high in the ashlands and around the volcano and all that.

Not directly, but it is dynamic based on weather and atmosphere in each region.