Input Manager "Sensitivity" and "Gravity", how can i zero it so i can only tune acceleration by code

I wish to know wich value coorrespond to a “0 delay” cause i want to manually tune acceleration of the player movement and other actions, i seted both values to 1000 and feels ok, but I rather have exact values, and what the description means “Speed to move towards target value for digital devices (units per sec)”