I need education on the Thermoquad "staged accelerator pump" , that gives an additional shot when the secondaries open

Yes, sort of......

Not sure which model # was the cut in, but at some point a small portion of the remaining pump shot was saved for the opening of the secondaries.
Having used these carbs for 45 yrs, I have never had the need to use the inner hole on the acc pump arm. The triple pri boosters provide a very strong signal & a heap of pump shot is generally not needed.
Yes, these fabulous carbs continue to amaze us.......