Former AA/26 yard/AA trap shooter here (and five gun AAA skeet shooter - better at skeet).
Shooting trap, especially handicap, is as close to shooting a rifle as can be with a shotgun.
People sometimes develop a flinch, not because of recoil, but because their mind refuses to accept the sight picture when they otherwise want to touch it off.
The release trigger worked because it was A: A different movement than before and B: It was relaxing the tension versus applying tension.
People could get as good as they were before the flinch, but a release trigger generally never helped anyone otherwise.
Now, I'm just a duffer benchrest shooter, but I've been around the block a couple of times. With what I understand about both games, I do not see a release trigger helping beyond the excellent triggers that we have available today.
Changing the topic slightly, if you go over to the benchrest airgun sub-forum and search around a bit, you'll find a big dust up about the use of electronic triggers in general and also, more specifically, about those that are "remote". Basically, a fellow that's physically disabled finds it easier to use a remote electronic trigger.
I wouldn't want to try it myself, but perhaps an electronic trigger with the "trigger" being a button on the joystick or similar would be an advantage.
Just stirrin' the pot. Not enough "spirited debate" lately.