Yap you are right M1 will automatically be shifted to M2 and onwards.....
But again.... you will get the max torque in D which should be utilized as a launch control....
It is a CVT which gives optimum pull in D... when revs got higher torque decreases and here comes the bhp in action which is again less.....
Corolla plays with better power to wt ratio and torque.... if you remove torque than corolla 
Regarding rolling start in D .... well the overall slugnishness of Grande puts questions i shared above....
Although you know i am 1.5T user now but my previous experience and encounters with Oriel X when having Grande was just like people used to say....
Or may be i was a continuous HOBC user mostly Total from day 1 in Grande.... and it means a lot even in NA engines
