When the tiller is centered the fluid is trapped in both lines so the nose wheel is centered, not castoring. You want the nosewheel to go straight down the runway during takeoff. The rudder pedal steering on Boeings has about 1/10 the travel to the tiller. You want most of the crosswind correction to be done with ailerons on the ground then as the nose comes up do what you need with the rudder.