it would be nice to have a mutation for seeing in the dark. you could have a lab that was working on nocturnal insects and get the mutation after beating the boss

It's called increasing your gamma.......but your right the default gamma setting means that with a torch you see roughly you height away and outside that distance is black.  That means night runs can be ruined real quick when all of a sudden 4 red orbs light up Infront of you as you couldn't see movement in the zone outside the torch.

In many areas it's better to ignore using a torch and go shield and weapon so yeah a night vision mutation would be great as the current lighting fails......maybe base it on how many firefly's you kill