You make a good point, but I think from my personal experience and what I have actually witnessed on a 747, there is a greater hazard from unintentional brake application through covering the brake pedal with one's foot than there is the hazard of not being able to lift one's foot because one is pressing for all one's worth on the rudder pedal. It takes a moment to lift both feet a couple of inches. Being aware of both sides, it is up to Pruners to decide, but I'll tell you, it was ever so embarrassing for the pilot involved to try and explain to the Flight Manager why we abandoned take-off with 400 passengers and blew 4 tyres! And no, it was not me what done it!