Bobmech,
This is not a new "problem" - I too have driven automatics for years, and in my experience the tickover rate of the engine at idle will dictate the amount of power/torque applied by the autobox - hence the creep forward when you take your foot off the brake. If the tickover rate is increased it is less likely to roll backwards on a hill.
I have test-driven the Grand Cherokee with Auto-box on and off-road, and the instructor pointed out an unusual feature of that car which is that once in drive, it will not roll back on an incline - a feature he said which was not available in most other automatics.
An annoying "feature" of my XC90 is that if in gear and pointing down a slope (say in a queue at traffic lights), the parking brake will not hold it - I have to put the car into Neutral and use the parking brake, or hold it with the foot-brake thus blinding people behind with my brake lights at night.
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