1) Why touch the TOGA button after engine failure? The calculated derate covers the obstacle clearance. It is just (sometimes) a long sit to flap retraction altitude.
I specifically brief the use of derate and the dangers involved as we not do it on a daily basis (empty/postitioning flights).
2) I always wondered wy the assumed temp will not go beyond 60 degrees C (in my company, B737). Is there as special reason why not to allow 100 degrees??? It gives the benefit of not to worry about V2min etc...