LEM, I don't quite understand what you are getting at. If you want a little more power on the approach while autothrust is engaged in the Airbus then you simply move the levers a touch forward out of the detent and the autothrust system gives it to you. You put the levers back in the detent and autothrust automatically reengages (til 100 ft) . And I am a big fan of trend vectors, they are a very simple way of allowing you to set power to maintain speed stability, you move the levers until the trend arrow disappears - I don't know what could be easier.