[MrFlippant]

That is very helpful, thank you!
What do you think about integrating a touch display screen? Will it distract you while racing?

A touch display of the size that would fit on the side of a typical slot car controller would not be any more user friendly than a few buttons or knobs. Besides, what would you display on it?

If you want to have so much control over the throttle response that you believe a display is needed (beyond the position of a couple of knobs, for example), then one could use a very small OLED display but use the knobs and buttons for input/management of the settings. Take a look at the Scorpius Wireless controller for an example of that, or the one in development by Sillage Racing, where he shows the actual throttle curve on the screen while you make adjustments with the knobs/buttons.

As Alan said, these things are fine to mess with between races or while testing, but not during a race. You'll need quick, tactile buttons for both lane changing and brakes (which, while not adjustable, are still used for a variety of functions). Maybe having quick access to one knob that adjusts something about the throttle curve, such as min speed or max speed, could be handy during a race, but only if it's something that can be adjusted while not looking at the knob or a screen. One must keep an eye on their car while racing, but can usually turn a knob or press a button with their non-trigger hand.