Interesting info. By comparison, my employer permits the RHS occupant (regardless of rank or operating capacity) to abandon a take-off only where the LHS occupant is incapacitated. In practice this means that the f/o cannot normally make the decision to reject.
The rationale? Logical, really. The decision to stop is, save for the engine fire case, rarely clear cut. A large number of factors have to be evaluated and a decision made on the basis of experience. The f/o could have the experience and ability to make such an evaluation, but then again her or she may not. The RHS occupant could be a marginal, 250 hour wonder or someone who has just failed a command course due to poor decision-making ability.
The ops manual sums up the situation succinctly by stating that the final decision in all maters affecting the safety of the aircraft must be the Commander’s. Nuf said.