Regarding throttles and power delivery: I'm with Jimod on this one. I've said it before on this forum that it makes me wonder if any of the software designers ever actually ride the bikes using their controllers. The lack of being able to travel with minimum or no effort will definitely put off a large percentage of prospective e-bikers, i.e. those that don't want to or are unable to make any effort. Present systems are fine for cyclists that just want help up hills and into the wind or to maintain a slightly higher average speed.
To me the ideal system is one that gives adjustable power as soon as you start pedalling, the power being adjustable between zero and full power by means of a power control knob or panel. Then, the addition of a throttle that can over-ride the pedal control system so that you can travel without pedalling if you want.
If I remember, the Storck Raddar had something similar, but when I rode it, I only used full power for hill-climbing, so I didn't really get a chance to explore it, The Bosch-motored Haibike wasn't bad simply because it gave a lot of power, so you didn't have to pedal very hard, but without throttles, neither would be suitable for unfit non-cyclists.
It seems to me that most of the efforts in the industry seem to be directed towards existing cyclists. They need to think about other target markets. Some have tried with the electric scooter types, but with only a nominal 250watts, they're pretty useless when it comes to hills.