Have you tried one before? Because I can genuinely tell you that the amount of instant acceleration that you get when you use it can not be replicated by just pressing down harder.
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I haven't tried that exact one, but I remapped my BMW to get rid of the exact thing you are adding. It only hooks in to the throttle pedal, it can't possibly do anything else. All it is doing is amplifying the signal coming out of the pedal, which is the same thing as pushing it down further.
Think about how it connects, there are just 2 connectors and it goes inline with the throttle pedal. So the signal coming in to the box is the same as the ECU would normally see. The ECU has a parameter for the throttle pedal (max and min voltage) and that corresponds to 0-100% throttle. The pedal commander cannot go outside of that range or it will throw an error code. So, that means the only thing it is doing is changing the response curve for the pedal depending on the input. Like I said in my other post, this means you get to a higher throttle percentage much quicker, but it is literally the same thing as pressing the pedal down faster. If it replaced the sensor on the accelerator, then you could potentially be getting rid of lag built in to the stock sensor, but it does not.
Try this in your car, start accelerating at 50% pedal travel for a few seconds, then push the pedal the other 50% of the way down. You will notice very little difference in acceleration because your ECU sees your pedal as being almost at maximum already. I don't doubt the car feels quicker in daily driving, like I said before, that is why many manufacturers put a similar curve in their cars from the factory. It feels sporty and peppy. It is also part of what goes on in most cars when you press the sport button.
Personally I don't want my pedal to lie for me. If I want 50% throttle, I will push the throttle down 50% of the way. I don't want 90% throttle when it is 50% down because then you lose the linearity and control that you need if you are pushing the car. If you are happy with it, then by all means enjoy it, but that doesn't change the way it works. I just wanted to make sure there wasn't misinformation out there on what it does. It sounds like you enjoy it so then it was a good purchase!