Lets make some sense of all this;
These cars, like virtually all new cars these days, need no specific break in period, however, like all other cars, the engine does losen up a bit, and start to run a little smoother when a few, 8ooo? or 12000? or whatever thousand miles have been done. The ECU is not programmed to interact with this normal bedding in process and will not change anything as it happens, and has'nt the intelligence to know when it has happened. The ECU does regognise pedal movement and works to provide the smooth docile response.
Most new cars have "fly by wire" throttle, its been around since the miidle 1980's. The advantage is a lighter, smoother accelerator pedal as theres no friction from a cable, and no maintainance needed. The disadvantage is the lag time caused by the slow signal. The throttle response is designed to be tame in order to make it drivable, predicable, easy to drive, for the "average" driver. But this can be cleared by the re set process, but the lag time will remain, you cant get rid of that unless you go for the SBooster. My wife will not drive mine since I fitted the Sprint Booster as it has become more fierce and harder to drive, especially in traffic. She was quite comfortable with it before. A few days ago I sat at the controls of a nice 1979 Aston DB5, no fly by wire here! 2 throttle cables and two massive carbs. Engine reved instantly, awsome power, and a complete animal to drive!
Hope this helps,
Steve