Some Easy Drawing Questions, I hope?

Greetings All,

I have a few simple (should be simple, I think) questions related to drawings.

1) In many cases I want to call out a hole (that is not a full 360 degrees) as a diameter and SW forces a radius callout. Is there a method to override and use a diameter callout?

2) I struggle to create dimensions to projected intersections. I think I was told in the past that I need to create a point (which is a PITA), and then if I use the point it becomes a sketch entity and often over defines the sketch.

Please tell me there is a way to snap dimensions to intersections, projected intersections and other geometry that is really already there?

Thank you all in advance for the help.

SolidworksDrawings And Detailing