Originally Posted by
Absurdity
Waist, thighs, arms, etc could be possible since those "bones" already exist (the skeleton that models are rigged to for the purpose of animating them) and they could use the system they already have for racial scaling to allow you to adjust those, any butt scaling however is unfortunately rather unlikely.
Because butt "bones" do not currently exist, which would mean adding them to the skeleton and then redoing the rigging for every single piece of leg gear in the entire game to use those bones.