I thought the whole point of geared LSD was to counter torque steer.
As you're aware, LSD stands for limited slip differential so limiting slip in the drive wheels is it's purpose. It doesn't always provide both front wheels with the same amount of torque on a slippery surface - like a wet road - though both wheels will drive the car forward, as one wheel will receive more torque, or get better traction than the other because of road conditions, suspension geometry changes, or the design of the diff itself. Torque steer happens because the wheel that has most traction or receives most torque gets the best forward drive compared with the other wheel: If the left wheel most then it will also have more tractive force and the car will turn to the right when accelerating, and vice versa if the right wheel has most grip. With an LSD either left or right wheels will be fed more torque as grip levels change and the car will pull in the opposite way to this as the wheel with most grip changes. The driver will correct the steering to counteract the torque. It gets interesting if, say, the left wheel has most grip or torque and the car drives towards the right so the driver corrects to the left. But then, if the right wheel gets better traction it will also receive more torque and the front wheels will drive to the left adding to the driver's counter steering so the journey becomes a battle to keep on the road.
I'm afraid I also don't see the argument about torque-steer and MacPherson vs wishbones.
It's because of suspension geometry called kingpin offset which is a function of kingpin inclination. A small value of kingpin offset is required to minimise torque steer and this can be more closely set to optimum on cars with unequal length double wisbone suspension like the latest Alfas. If you Google these terms I'm sure something useful will pop up. The greater the kingpin offset, the worse will be the torque steer. Deep dished, big offset road wheels will give you a similar affect. Similarly, it's worse as engine torque increases.
This is easily illustrated by driving a v6 GTV then v6 147/156/166/GT/Brera down the same piece of road
The new Renault Clio and Megane Sport (or whatever they're called) have MacPherson struts but with what Renault call a double axis front strut suspension, which they claim is immune to the torque steer that plagues high-performance MacPherson strut-type FWD cars.
I've heard the arguments about unequal length driveshafts causing torque steer (and barely understand that!).
A shorter shaft will transmit more torque to the road than a longer one so you'll have a steering effect.