The campaign map doesn't use settings in the same way other maps do. For example, it has a map size that's actually larger than what you can get through New Game maps. Shards are similarly always the same, as the campaign map never actually changes. Doomsday speed is always normal though, I believe.

I am, it's been said by devs before. When you play through it, it becomes pretty obvious that it's larger than huge. It also is the only map to accommodate all seven rival races.