Hi Mutt,
(Sorry for digressing a bit.)
Our Loadcontrol computer system allowed us to overwrite weights, as long as you confirmed them. As long as ZFW plus takeoff fuel was less than stated MTOW, if would allow a loadsheet to be produced. This is when we showed 1000kgs taxi fuel to permit calculations. You could enter any weight and index you wanted. And we only had MZFM MTOW and MLAN in our system. No maximum ramp weight on it. We also regularly increased the taxi fuel at captain's request on BAE 146 aircraft as these loadsheets were manual, often with curved drop lines. Manual loadsheets were also used periodically when major weight issues needed overcoming on other types.
OK, then answer this, why does Boeing publish takeoff weights above Maximum Structural?
That I have no idea. I am curious as to why. I didn't know they did that. (Maybe they know how despatchers and flight crew work together to get all traffic on-board through "creative" solutions?)