It allows you to select from three strengths of feedback provided by the steering wheel, while you can also adjust the system's sensitivity. (carbuyer.co.uk)
Further the strength of the feedbacks depend on the initial conditions (like ice age — interglacial). (realclimate.org)
Although the strength of this feedback varies somewhat among models, its overall impact on the spread of model climate sensitivities is reduced by lapse rate feedback, which tends to be anti-correlated. (ipcc.ch)