3. As for the leaning of the bike, that is very normal and expected for this bike because the drive shaft is on the left side of the swing arm. The driveshaft is actually pulling the rear wheel slightly to the left, causing the bike to track slightly left. You can try to weigh the right side of your bike down to counter act it but it usually doesn't work, its just something you will have to put up with. This one of the areas where a chain drive bike has advantage because you can easily adjust the rear wheel to track perfectly straight.
I would love to see a free body diagram of this. How does the driveshaft "pull" the wheel to the left? The forces/moments generated by the gearing are opposed by the bearings in the final drive, and those forces react against the swing arm/swing arm bearings through the final drive pumpkin. There might be a miniscule amount of deflection in the bearing supports/swing arm, but we're talking thousandths of an inch. The majority of the force (which generates the wheel torque) between the pinion and the gear is in the vertical axis, with a bit of front/back due to the hypoid gear. It's the vertical force which BMW, Guzzi, and Kawasaki (Concurs) ground with their 2-piece drive shafts. The S-10 just has a super-long driveshaft.
I just don't see how this claim is manifest. Looking down from above on the bike, if you wanted to force the bike to steer left, you would have to rotate the wheel in the vertical axis CW. How is that force generated?