I'm trying to create dotted lines that are actually circles and not square shaped dots (the given option in the outline menu). Is the best/only way to do this by creating a new Artistic Media Brush? It seems like there should be an easier option when needing to create a long dotted line or a shape with a dotted outline.
I think Kiefer is looking for a way to create round/circular dots, not round dots in a circle. :) See the Outline variations, the dots are all square. I don't think we can make them circular. We can add an outline and use rounded ends and caps, but you only end up with a flat oval. You can create your own dotted outline, but the "dots" will always square.
So the best option is to create our own with Artistic Media object sprayer.
How about using the text tool and the fullstop on your keyboard with a font like Arial rounded. You can then fit the text (dotted line) to any path.