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Sorry, I didn't realize that the scale feature was an OmniGraffle Pro-only feature. You'll want to pick a diagram scale that isn't too hard to apply manually :-) If you're using English units, I would suggest using a minor grid spacing of 12 if you have the major grid representing 1 foot.

Also, line labels have some inspector goodies in the Properties: Geometry inspector (cmd-2) which allow you to control exact placement and orientation of the labels.