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I drive in DS mode when in heavy highway and interstate traffic.When you put the cruise control on it also reduces the RPMs until you need the power: it will down shift more quickly to the lowest gear required to be efficent.I use DS most of the time for spirited driving conditions.
DS basically holds lower gears longer and downshifts sooner. All in All it makes the car 'feel' sportier. I don't know of any engine modifications as such by switching to DS mode.
Since my transmission update, my transmission downshifts aggressively during hard braking. I like this feature because it helps eliminate the lag that plagues many of us
Brian