MotoGP Physics of Knee Sliding

I know they generally do it to feel how far they are leant over.

But I have some questions in my mind that are bugging me so I wanted ask you guys.

-Can sliding your knee on the tarmac create a torue along the yaw axis of the bike and pull the bike in to the corner a little?

-Is is it possible to push with your knee when you are leant over to pick the bike upright quicker, to make transitions side to side faster? I think it would be possible in physics point of view, but I don’t know if I am missing something.

-Is it beneficial to put some weight on your knee when cornering in a steady state, or does it decrease vertical load on the tires and cause you to lose grip?

-Is it possible to save the bike losing the front tire grip and about to fall, by applying a torque with your knee along the roll axis?

Thank you very much r/Physics!