I did a bunch of user testing and research to figure out what would be better for most users on trackpad or mouse, and I have to condense all of that down into a menu option so people can have a good experience. But in Getting Over It you're not pointing at things, you're giving relative impulse to the hammer, so it's not the same metaphor and the same assumptions don't apply.
Everyone already has an opinion about mouse acceleration when it comes to pointing at things.
