Do you know of any study or evaluation of the use of mouse cursors specifically designed for the use in diagrams?
For example I'm thinking about using a cross hair instead of an arrow cursor when I want to select something in a scatter plot. Is it wise to have a gap in the centre of the cross hair to not cover what interests you or is it better if it has the inverse colour of what it is covering?
Is there a good source that covers questions like these? What is your experience?