Summary
Double-click on the shape layer in the viewer to select a path.
UI
Active ON : Enable Pathsel in WQPro.
Active OFF : Disable Pathsel in WQPro.
Double click
No modifier key : The path is selected. Double-click again to deselect.
*The double-click target is the shape layer.
Double-clicking on other layers or on the timeline will perform normal AE operations.