Even with Start/Stop off, the eTorque still acts as a regenerative brake. This may not be related to what you are seeing but under certain conditions when braking moderately, the eTorque electric motor will haul thr engine all the way down to 0 RPM. Once the truck is dead still, the engine will feel like it relaxes with a slight shutter then stop (Start/Stop enabled). I'm guessing it's the torque converter unlocking which decouple the motor from the transmission while the brakes are held on. I haven't tried to do this with Start/Stop off.
So, yes, I've seen the engine go all the way to 0 RPM without it idling then shut off. Its hard to brake intentionally to see this. Anyone notice this?