You kind of can. It just takes extra work. Luma can already save the screenshot with separate images of the left and right eye. Then you just need some other method of viewing them in 3D on a different screen. You could probably find a way to...
Alright, well I've been looking into this a lot myself. I am particularly interested in enabling the 3D slider on games where it's disabled. Even though it doesn't fully enable 3D, I like the effect of the parallax barrier being activated and the...