There's some value in the elastic trailer ties, in that they resist, but it isn't a hard cold solid restraint that sometimes is the trigger for panic, the harder they pull, the more resistance, but they can learn to stop at a lighter touch too. we used to have a section of bicycle inner tube on tie lines at a stable I was at.
Quick releases are really good to have at the fasten point in the trailer, in case of emergency where you either can't get the knot undone, or they are pulling against it too much to undo regular snaps. Especially if there has been an accident.
HMM. Might not be a bad idea then. I was just thinking it was another attatchment that could pop.