@ Firesong, yeah the midnight sun is kind of an issue. On summer solstice, there's 20 hours of daylight; on winter solstice, there's 4 hours of daylight.
I'm still planning on keeping with the normal overland travel times (by the books, 8 hours of travel in a day, any more is considered a forced march), so at certain times of year a party might be traveling in darkness for part of the time, or resting while it's still daylight.
TBH, before this game, I always kind of glossed over Neanderthals and the Primeval PrC. Probably because I tend to play casters, but I never gave them a lot of thought before. Looking back over them I can see their coolness.