Question for Creationists?

Human limb regeneration... or rather, our lack of it. If a 'lowly' salamander loses a limb, it can grow another one. It does this by reactivating the genetic instructions for limb formation that, in the embryo, formed the limb first time round. If we are such important creatures to the Creator, why did he not bother to endow us with this ability? Why do mammals in general not have this blatantly useful feature?