As a lowly single engine pilot I'm interested in this also.
How marginal is the single engine performance of big twins machines? Can you always fly at Vy at MTOW with one engine? What about at 30kts?
If it can fly (ROC) at 30 knots with one engine out I can't help thinking a maximum performance style takeoff with an abort point may actually be less risky if anything else failed e.g. tail rotor (aw139 Leicester)