It's funny, I think I'm fairly geeky about my electric cars (I also have a Leaf), but it always shocks me how much thought and effort people want to put into their driving. All this talk about pressing the paddles a certain number of times when the traffic is a certain way, etc. It seems exhausting to me! On the Leaf, you have two choices for the amount of Regen, normal, which is not very much, and B mode, which has a moderate amount of regen. That's a reasonable choice. Set it when you start to drive, and don't think about it.
I find the way the paddles work on the Clarity baffling. Makes no sense to me that you would use the paddles to set a regen level but then it changes? I've tried it, I don't understand it. I find myself constantly looking for those small arrows. Why would I want it constantly changing? Too much looking and thinking, and pressing of buttons. The idea is that when you take your foot off the accelerator, the car should "brake" for you at your desired level. It's supposed to be simpler one pedal driving with less moving of your foot from the accelerator to the brake. The selected level should stay until you change it.
It seems that a few people in this thread seem to think that using the paddles uses more regen than pressing the brake pedal. It does not. Pressing the brake pedal will do the same thing, as long as you are not braking hard and using the disc brakes.
Anyway, different strokes for different folks I guess!