John,
here's the picture.

Compare pictures two and three. Force which compresses both springs remains the same, but torque changes. Assuming that energy stored in the sway bar didn't change we come to a conclusion that torques had to be redistributed. The only way to compensate for this change is to change forces acting on the tires... Torques would redistribute differently if we shorten opposite end...
That's as much as I can tell. We would need to talk to a suspension engeneer to figure out how to calculate things, because frankly I'm not sure how the sway bar moves/works under load.
There is no lateral displacement unless you use SCA bar

, so the bar IS attached in the center. There is some fore/aft movement which is affected by the bushes and there is twisting effort which we are talking about.
gotta go,
--alex
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Tour I: 96 GL(sort of) V6 ATX -- mild enhancements
Tour II: 98 SE V6 MTX Sport -- getting better