Suggestion: to press Shift to control Mouse Movement in a straight way horizontally (if moving horizontally from a certain point) and vertically (if moving vertically from a certain point), if not using any of the Tools. It would be somewhat similar to the Line Tool, but only for horizontal and vertical Mouse Movement, so as to precisely position the cursor before you start drawing.
Suggestion: no need to press Alt to input command in cases such as closing a file. E.g., the option to not save has Alt & n, but why not simply n?