When annotating a drawing, holding shift restricts the cursor to only 90° and 45° angles. It would be beneficial to add an option that allows the user to select other standard angle intervals, e.g. 5°, 15°, 22.5°, and 30°. For example, if I am marking up an isometric drawing, I could navigate to Preferences > Tools > Markup > [Restrict Cursor To]:, disable the checkbox for 45° and enable checkboxes for 15° and 30°, etc..