Establish an option screen that allows the user to select whether or not automatic dimensioning is turned on or off. If on, then Sketchup should automatically draw and display dimensions for each object such as rectangles, cubes, circles, cylinders, etc. There should be a button for this option to facilitate easily turning the option on or off. Of course thought should be given to what kinds of objects can be automatically dimensioned. Surely wouldn’t want to dimension every line segment. Nor would it measure every side of an object, only width, length, height one time per object.
Ken