The need for the verse 'And you shall do what is right and good'

According to you, the contents of morality are not carved out of the Torah but from moral intuitions, and yet the very validity of morality derives from G-d. In light of this, I wonder why there is a need for the commandment, "And you shall do what is right and good"? Even without the verse, man would have had to respond to his intuitions (from the divine validity). And you know that it is so, because G-d came with complaints to those who behaved immorally, even before the giving of the Torah.
Can we say that the verse only comes to add a religious dimension (as in, for example, the meaning of the religious prohibition of 'You shall not murder')? In other words, beyond the fact that there is a moral value in behaving morally, there is also a religious virtue – and this is the meaning of the verse 'And you made a song and a good deed'.