I should be able to select a thru hole, click a "same as" button and select a countersunk threaded depth hole and make the thru hole change all characteristics to match the threaded hole without having to manually change them individually. EVERY type of operation - holes, extrusions, round, chamfer, etc - should be able to be changed instantly to be the "same as" another of the same operation type. A simple check box would determine whether the dimensions are all related or remain unrelated. The "equals" function would allow the individual variables to be related. The use of equations to relate such items is too cumbersome and unclear to future editors of the model.