So when I read that the grenade had an adjustable setting that any infantryman could adjust the BS meter in my head went off. Not sure where you read that. I can't remember any hand grenade that had an adjustable timer as you describe.
The way it was done, is you "assumed" a 3-5 second minimum delay before it went bang!
I was taught how to cook off a grenade prior to throwing it. Basically, pull the pin, let the spoon release, count, then toss.
Another method I've heard about is to have your buddy pull the pin and release the spoon, toss the grenade to you, then you throw. Never tried that.
It was in the text of the article where the writer attributes Cleland's injuries to picking up a handgrenade after he gets off the helo and it goes off. The story is some "green" enlisted guy set the fuse to a "hair trigger". Whatever that's supposed to mean.
A poster said he heard Cleland blame himself (in person) and that he had hung the grenade from his web gear improperly (read, by the pin) and when he jumped to the ground the grenade came loose leaving the pin dangling from his web gear. Max go boom.