These MC settings will only apply when in an MC command called version of CAS, not in EAs version. Note there is a similar option for Slider Multiple:Body, but a Core Mod such as the one by Consort at MTS is required to prevent sims from snapping back to within range during gameplay on the weight and fitness sliders.
The default is 1, so changing that to 2 will extend the slider to 2x maximum in both directions.
