How Inflexible are Allah's Inheritance Directives?

In distributing the wealth of a deceased benefactor, are Muslims given freedom or at least some flexibility in determining the portions each of the heirs shall receive?  Suppose a deceased father has two heirs:  a wealthy son and a daughter living in great poverty.  If most of the father's wealth were given to the daughter, it would lift her out of poverty.  Yet one is confronted by not just by the decree of Quran 4:11: "Allah charges you concerning (the provision for) your children: to the male the equivalent of the portion of two females," but also by the threat in the nearby verse, Quran 4:14:  And whoever disobeys Allah and His Messenger and transgresses His limits - He will put him into the Fire to abide eternally therein."
So, to avoid being tortured forever by Allah, any Muslim distributing the wealth of the dead father must ensure that the wealthy son gets twice as much as the impoverished daughter.  Alas, no Debate Question here.