topgas, in simple terms V1 is "decision speed", when take off performance is "balanced field" the distance from brake released to decision to stop, including approx 2 secs decision making is the same as the distance from decision to go until lift off. In non tech terms Accelerate stop distance = Accelerate go distance. In the real world, the trust available for a given weight usually results in an additional "stop margin" and thus we reduce the thrust to save engine life and in certain conditions, potential control problems if an engine fails ( wet/ contaminated runways etc). The answer to your question is that in performance terms if you can go, you can stop, thus if V1 was higher there would be no issues provided the crew acted in a timely manner. The auto brakes automatically activate after the thrust levers are retarded and reverse selected, but this time for "essential actions" is built into the performance tools.