yeah, ya can change the zone to look like a cube or cone or whatever. but it just looks like a cube or cylinder. it still influences the joint in a spherical zone. IIRC it's

sphereZoneProp Mag Zone 2:1
        {
        storageOffset 0 0.3487 0
        objFileGeom 0 0 :Runtime:geometries:props:ball.obj
        }

and ya change it to some other prop. not that it matters. at least not until we get poser 7.