Flick up letter to shift
When I first saw this feature on apple keyboards I thought it was cool, but for some reason it causes me problems. You would think I'd get it to work but it just doent for me. Seriously at least half the time I get the wrong thing unless I'm slow and intentional.
I tried one other kb before this one and the press and hold to make the alternate key worked for me every time. For the same unknown reason. It just seemed intuitive and I didn't make those kind of mistakes.
All that said I'd still like to see one of those options, as another option to always moving down to the shift key.