Originally Posted by WindSheer
That goes totally against modern CRM practices.
In what way?
As has been pointed out, the rejected takeoff decision isn't a group decision because there is no time. Where CRM enters into such a decision is in the takeoff briefing during the cockpit check where the captain ensures that everybody comprehends and agrees with how a reject will be done and what each members' duties are.
If your comment is of the thinking that the F/O, if he/she is doing the takeoff, should have the decision-making capability, then you are just changing the location of the single decision to reject.
Beyond this, if you haven't already, please read the entire thread as this and other similar points have been discussed and your point, if this isn't it, may be addressed.