I see under Options where I can control the Image Quality under Document Properties. How can I make a setting apply to all the documents I create or open so I don't have to change it for every document?
To keep document properties for future use you must save your assy/part/print as a template. Then when you start your next assy/part/print use the template you have saved.
I have templates saved for all my standards. Especially with drawings, I have my title block and separate templates for in/mm and separate templates for each paper size and orientation I use.