From a non-flying type,
1. Are "Bug-Settings" for V1 etc.. still (in this case A343) manually set prior to departure, or does the FMS handle all these data calculations and settings?
2. "IF" a rotation was commanded prior to v(rotate), does the deflection of ailerons increase drag and thus increase the length of runway required to achieve flying speed?
This is not an indication of what I think may/may not have happened, just a curious mind.
Invictus