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FSX (Released) M.I.T. - Maintenance and Income Tool

IIRC, without a limit, it should calculate available payload from the aircraft.cfg, i.e. MTOW - empty weight. But it could be that P3D does name the associated variables differently or does not feature them. Same for the center gear one.
Hmm yea I thought perhaps that it would calculate that much like AH2 does. It's also strange about that variable as it can be referenced but maybe cannot be adjusted directly?
I might have a play and let you know.
I've left everything Microsoft (Windows MSFS) behind, so I can not offer anymore support, sorry.