i wonder if it will be able to see the type of finger gesture, like if you flick the computer off in a joking way over some small frustration, it will be able to differentiate between that and a truly angry flick.

I believe that the idea is that by peeking, they can see one reality, but, since they didn't technically cause one reality to collapse, they can peek again and then the outcome has a 50% chance to have a different outcome.