Re: Useful things for a wristjob.
1. The Apple watch has this facility
2. Can't see the real utility myself and the digital crown works very well. The screen being obsured isn't much of an issue in daily use.
3. See http://furbo.org/2015/07/14/a-watch-water-and-workouts/. Basically, it's waterproof.
4. A self-charging mechanism would be advantageous. That said, I get about 2 days charge wich ain't too bad for a first gen product.
Biting the hand that feeds IT
