In my experience with my 5.7 eTorque, an eTorque start will accelerate differently than an aggressive throttle non-eTorque start.
I think the MGU start (motor-generator unit, which is the 'muscle' of the system) motors (meaning spins up to do its electric motor starting of the gas engine and moving the truck) only up to a certain RPM, and will never perform like a gas engine 'full throttle' start.
If I'm at a stoplight and I anticipate a need for fast acceleration, I'll watch the opposite direction traffic lights and anticpate my green, lifting off the brake before I need to, which starts the gas engine seamlessly back up. When I get my green light a quick moment later, then I'll hammer the accel pedal and get full gas engine performance.
If I'm at a stop, the eTorque start/stop is active, and my left foot is on the brake....if I floor the accel pedal with my right foot and then left off the brake, the truck will ease forward at the MGU/eTorque's normal speed for it's half of a wheel turn or so. When the gas engine relights, it will then lurch forward at the gas engine's higher acceleration capability, which is felt in my 'butt dynomometer'.
I perceive that eTorque's sole purpose is to increase fuel efficiency by making the 'at intersection start/stop process' more acceptable, and I think it does that job very well. The eTorque start/stops are MUCH more pleasant than other systems I've experienced that use only the traditional electric starter motor.