With manually set takeoff thrust on turbofan engines (L1011, B707 for example), the thrust must be set before a certain speed, between 40 to 80 knots for instance. To try and increase EPR to counteract the ram air EPR reduction will result in engine overboost.
INS's will align near the poles, but the time required can be rather long.
Having done full stalls in large transport jet aircraft (TriStar), the view can be, as Notso has indicated, quite exciting.
