I'm with Stilton on this one. From the Boeing manual:
Rejected Takeoff
Selecting RTO prior to takeoff arms the autobrake system. The RTO mode can be
selected only on the ground. The RTO autobrake setting commands maximum
braking pressure if:
• the airplane is on the ground
• groundspeed is above 85 knots, and
• both thrust levers are retarded to idle
Maximum braking is obtained in this mode. If an RTO is initiated below 85 knots,
the RTO autobrake function does not operate.
Landing
Five levels of deceleration can be selected for landing. However, on dry runways,
the maximum autobrake deceleration rate in the landing mode is less than that
produced by full pedal braking
So, from this we can see that max manual braking does
not exceed the braking efforts of RTO, only 'Max Auto' when landing. Sorry, LeadSled, but I reckon you should set RTO, let it do its job and concentrate on keeping straight etc, as opposed to seeing if your feet are quicker than Boeing's systems. Of course, max manual braking should be used if RTO is not doing its job (and, from my experience, you know full well when it's working
)