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It does NOT affect regen. I drove about 50 miles in chill mode today with the steering set to comfort. It makes the car feel very different, I think a lot of people are going to like it (feels like a Lexus ES or something).
However, it's not for me. My car is back in sport steering and standard acceleration now
It changes the acceleration curve, pressing the pedal halfway still gives you the "jerky" feeling that some new EV drivers complain about before their right foot becomes calibrated.