That's the best argument I've heard so far for left lever/front brake. I'll have to weigh that against trying to signal (conventionally, with left hand) while braking. Maybe I'll get over the conventional signalling part, and just signal with my right hand while braking hard when a signal is necessary. OTOH, in traffic regulations, cyclists are typically excused from removing a hand from the controls in order to signal, when it is unsafe to do so, so I've been getting by on that up to now.