1. I agree with the majority that "hands off" at V1 is a good idea and stops any unwanted inappropriate reflex movement of the TLs. If you really need to do something with them after V1 (windshear, etc.), you know where they are.
2. Transferring the spare hand to the control column, if you have one, helps as you can perform a more accurate rotation. Physically, the accuracy to which you can apply a particular force is in inverse proportion to that force, so two hands are better than one in this respect.
3. It appears to be SOP in most airlines.