I am about to build up a new frame and for cable routing reasons I was considering switching to right-front. Interesting to see the issue brought up here. I guess my braking is so subconscious because I cant really say how I brake in a ratio of front to rear. I agree with Mycoatl that there may be issues with downshifting and braking at the same time. I know I do this, particularly when rapidly approaching a red light. I am not sure I want to be trying to shift (gripshifters) while braking at the same time. On the other had I can also think of situations when I am turning left in traffic, while going downhill. In this case, while signalling left I have no hand on the front brake. Trade offs I guess. I looked for Sheldons article and he agrees with the right-front layout, mostly for the dominant hand reasons.