I also don't like the D&D 9 points of morality. I didn't like the Palladium version of Scrupulous/Principled/etc either.
That said, I don't think that Morality is necessarily a callback to this.
At my table, I've talked to my players about their Morality relating to their Emotional Weakness/Strength. As they improve their morality, the role-playing aspect is to behave in line with their emotional strength more often than their weakness. As their morality declines, the role-playing affect is to go with their weakness more often. They use it like a percentage system almost - when you really are in doubt about what your character would do, roll percentile; get under your morality, go with your strength's approach, get over - give in to your weakness. That sounds arbitrary, but it's not a roll in every case - just a guide to help the PC's work out their characters motivation in a scene when it isn't coming naturally.
That's basically the only role that Morality has in my games - as a role-playing tool that specifically speaks to their emotional tendencies.