Actually, I was thinking of a more permanent decision, as in one you make on during character creation. If you like the idea, then I will allow you to make the change now. I am lenient on making changes to your character in the early stages of the campaign either because something didn't work out the way you thought it would or because there were options you didn't realize were available.
And Voda Vosa, we actually do have a write-up on dwarves, who are mostly enslaved by orcs and live in the mountains to the south. I'm not sure the neanderthal angle would work well anyway without deviating from the core rules. Dwarves are just as intelligent as any other race, though the idea of living in the frozen tundra would have been interesting.