Adam and Eve didn't act of their own freewill in fact Adam and Eve are a great example of how there is really not freewill. God never gave them a choice, he told them not to eat from the tree or else they would die. Even when they ate from the tree even this isn't an act of freewill, Eve had to be beguiled into eating from the tree thinking that it would not kill her, but rather that is would make her wise.
I'm not asking how God enables freewill, because there is not freewill. I'm asking; how is there freewill if God has to enable salvation? The answer is obvious that there isn't freewill if God has to enable you to have salvation.
Again evil is opposition to God. So God can't be evil because God does not oppose himself. Being that he is God he is above all and owns all, so he can do anythiing he pleases with what he owns. It is ironic you cite Romans 9 since this chapter and those specific verses destroy the premise of freewill and destroy the premise of stating that God is unjust for destroying the vessels of wrath. Just like the potter cannot be called unjust for making some pottery just to smash it and the shards cannot protest against him, so God cannot be called unjust for creating a wicked person and destroying them.
Really this touches on the great error of the idea of freewill in that it essentially puts man on the level of God and makes man deceived into thinking that he has a right to judge God. Man is utterly incapable of judging God just as the clay cannot really judge the potter, but it is the potter who does whatsoever he pleases with the clay and nobody can ever tell him he is unjust to do whatever he wants to do with what is rightfully his.
As for old Pharaoh you might want to go back and read Romans 9:15-22. Pharaoh never had freewill, nor did Moses, but God raised both of them up for his purpose and his will. To show his might in destroying Pharaoh and Egypt and to show his mercy in saving Moses and the Israelites.
So there is not really freewill, nor is there binary of wills between good and evil, there is only one will which is the will of God and those that have faith in God and those that do not have faith in God, and yet even the unfaithful are bound into the will of God and can and will be used to further the will of God just like Pharaoh and just like Moses.
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