.....Be great if you could find a simple way of swapping based on the drive ahead?
Not practical, really.
Oh I don't know: a moterised valve in the exhausts to switch the gas flow from side to rear, plus modifications to hte engine map, launch control and suspension damping are all possible, Jaguar can do it. All it needs is money for the development...
I rather like the idea, as used by Tesla, of a button labelled "Insane Mode"!