I wish that the Prius had adjustable regen perhaps with a stalk like the Volt. I hope that this will be added on the 2019 model year.
Your estimation of how long the development cycle for automobiles is, is too short. Assuming you had written a request in Japanese and some Toyota engineer read it, I think it could be included by the 2022 model year.
It has adjustable regen. You 'adjust' it with the accelerator (less pedal=more regen) and brake pedals (more pedal=more regen). Are you looking for more regen torque when your foot is lifted off the accelerator? I periodically drive a Tesla with excessive regen torque on accelerator pedal release. The first thing I do when I get in the car is turn that off. Other people seem to love it though and brag about one pedal driving. I notice they still use the brake pedal eventually so I'm not sure what the attraction is. I prefer Toyota's system. Maybe I'm just old but I prefer my braking torque to come mostly from the brake pedal. Of note is that a common request among Prius owners is zero regen when the accelerator pedal is released which runs even further away from the Tesla model. And sure, Toyota could make it a settable parameter for the car, but Toyotas are appliances for the masses. Toyota thinks they know best and I think they mostly get it right. Also keep in mind that Toyota got a bum rap on unintended acceleration in the past and I doubt they want cars out there that look the same but interpret the pedals radically differently. That seems like opening the door to another driver error-type lawsuit.
