In reality the autobrakes will, via RTO, get on the brakes sooner/harder & continue to apply them to the max, regardless of rudder input by your size 10's , much more consistently than you will. Every company I have flown with on the 737 (a few) have always advocated avoiding manual braking & letting RTO do the job ,whilst briefing PM to call if "autobrake disarm" illuminates. I have always assumed this was not only due to more consistent results (as discussed above) but the fact that the system was, in any case, giving you the absolute max courtesy of RTO. I am sure somewhere in the old grey matter I remember it being phrased something along the lines of "RTO is the equivalent of max manually applied pilot braking with no modulation to achieve a desired rate"
Edited to say, perhaps this ( & the similar thread appearing in Tech Log ) should be combined with the "737 common misunderstanding" one, as it seems a few of you misunderstood Mr Boeings RTO function ?