For the record, there is a greater deceleration that can be used other than RTO: max manual braking. Check up on on RTO procedures in QRH.
I think you might be confusing landing with takeoff... The QRH figures show that MAX MAN gives a shorter landing run than MAX AUTO. This is backed up by: "
...on dry runways, the maximum autobrake deceleration rate in the landing mode is less than that produced by full pedal braking...".
The only reference I can find to RTO performance says: "
Maximum braking is obtained in this mode", i.e. you won't get anything better by standing on the pedals.
From a purely practical point-of-view, I find it much easier to let the RTO autobrake do its thing which gives me more of a chance of keeping the aircraft on the runway. In a limiting crosswind, keeping full pressure on both pedals (that's quite a bit...)
and significantly varying the rudder deflection is no easy task.