A few 2-Step questions

What about a momentary button on your shifter you hold to allow the 2-step to be activated? Sorta like the line-loc button. That way the 2-step is only "awake" when you hold that button and your foot is on the brake. That would require foot and button release coordination though so maybe not ideal.

But maybe a variation of it? Use the button to activate a timer relay. Relay in series with brake pedal switch. Relay only stays engaged for like 5-10 seconds so it holds while you're standing on brake and gas but is off by the end of the pass so brake pedal switch has no bearing on the 2-step. Good for the street also since you would not be hitting that switch.

Just some ideas - lots of ways to do this!!