Sport mode - regen increases!

It's all software based. You can enable more aggressive regen (without touching the brake pedal) by just a push of a button in bZ4X.

 

Well, regen is technically part of throttle mapping.

At least if you read "throttle mapping" as "accelerator pedal mapping", which is what it must mean for a Prius.

 

If the behavior takes place when your foot is not touching the accelerator pedal can that be considered part of the mapping?

 

Not touching it isn't a special case - it's just a limit - one end of the mapping.

The natural implementation would be as a single curve covering the whole 0-100% pedal movement. Something like

0% depressed = -30kW
15% depressed = 0kW
100% depressed = +160kW

They could choose to have the drive mode not change the negative part, but there's no reason they couldn't change it.

There clearly is more to it than that - at low speeds regen turns into creep, but I'd imagine that's done as a post-processing step on the initial lookup ("if speed < X and brake released, set minimum output"). B mode may also be similar ("if output negative, multiply by X").

And maybe there is some reason the entire thing is split into accelerate and regeneration sections, but then you still have a mapping for both halves of the pedal travel, and fully released is still the left-hand end of one of them.