On the 757 we hardly ever do full power takeoffs, usually only when the engineers want one. More often than not we can use max reduction. As Mike J said, I think it would only enhance safety as the figures are based on the reduced thrust and there is more available if you need it, plus less wear & tear on the engine. On another note, with a full power takeoff, when you reduce to climb thrust, in the cabin it sounds like the engines have stopped- poor punters generally scared fartless!