SW has point in sketch, but this point can be used for hole creation or as additional point or as mating point or as ....

The same situation with construction line, it can be used as axis of revolution, as symmetry line, as line for some reference plane or for mating.

When I make complex design sketch for weldment frame I need ability to annotate some sketch entities to help me understand my sketch in the future, now I can use only stacked dimension for this.

     Is there other way to annotate sketch entity?