arcs'n'sparcs 
I'd say you're pretty close my memory is cranky on it too, and there is an aneroid device in the pump that adjusts the pressure/flow for altitude against commanded MAP. Hence no need to adjust FF on climb/descent. It's quite a complicated fuel pump as pumps go and perhaps only a short step from the turbine FCU.
That fuel pump, accurate injector size and fuel manifold pressure (spring loaded if I recall) are the heart of the engine.
You didn't work for Rex perchance?