I think he wants to be able to use less bag pressure by having more spring.
All the overloads are like what you describe and that is why StableLoads or something with the same function are so widely used. I would have to have 3" of sag before half of my upper overload spring even engages with stock stops. The other half of the spring engages at 3-1/2" sag. They did this to make the overload more progressive for a softer ride, but I'm not going to drive around with my tail 4" lower than stock just get my overloads working. If I just used my bags to level, I would be a bouncing all over because my overloads would be doing nothing...
