Is a caliper skin available with the rotational axis positioned at the caliper tip?  The Concise skin has the axis at the bar but that obscures 3/4 of the image you are trying to measure, so having it at the tip would make positioning the calipers much more precise.  Also, is there an option to position the two caliper tips with mouse clicks instead of dragging and sliding the caliper?  This feature would GREATLY speed up measurements.