IIRC the change for the smart tool was from X1 to X2. AFAIK apart from take lane use the smart tool hasn't changed in X3 from X2.
Try right click and drag to lasso select, or single left click for individual selection.
The scroll lock while editing is an option you can turn on or off. TV---->Options--->Click Behaviour--->Left click locks scroll. It's to stop the notes or clips you are editing disappearing when editing.
To restart scrolling right click in the top half of the time line. Personally I find it great once you get used to it.
HTH