Earlier quoted context omitted.
> I'd be surprised if they didn't recharge it by pedaling. ;) I'd be surprised if they did. A dynamo adds a noticeable load on the bike, and the people buying this are already optimising for small improvements. Adding a dynamo to power it would probably be a net negative for performance.
They should generate power from the motion of the shift levers.
How much power would that really generate? You can't make them too stiff, since part of the reason people like electronic shifting is that it's easy to do when your hands are numb from cold.