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What if the car actually used the suspension to 'drop' just a fraction of an inch lower to the ground (to increase its momentary, apparent weight) as soon as you punch the accelerator to get some extra grip? I wonder how much of a difference the momentary 'downforce' would make.

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You'd be better off raising the ride height as the dynamics of raising the ride height will increase downforce on the wheel/tire assembly at the start of the transient.

It probably will do that. Atleast to compensate for the added apparent weight on the rear at acceleration. And slightly decrease air flow resistance under the car. Formula 1 cars do something like that

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