Something I found out with my DSG 'box today.
After some 'spirited' driving on country roads with the box in S, I came down a steep incline into a 40mph limit, so moved the gearbox to D and took my foot off the gas. On the flat, the DSG would have gone up the gears until the revs were about 1000-1500rpm, but on this occasion, they stayed close to 3000, like an experienced driver would with a manual 'box.
There must be a tilt sensor, or some accelerometer setting that senses when the car is not slowing down with no gas in order to use engine braking. It's not something I've noticed before.