 By deploying the slats at the same time as the ailerons, the torque can be equalled out on either side of the spars, eliminating the twisting, which improves the control authority of the ailerons.This means that less aileron input is needed to produce a given motion, which, in turn, will reduce aileron drag and its associated negative control aspects.Better yet, the wing is already designed to be extremely strong in the lift component, eliminating the torque requires lift, converting the undesired torque into an acceptable lift component.