"Quantity Measure" -> lots of clicks required

During an internal training I gave yesterday, I got some comments from first-time users about the quantity measure:

  1. To get a simple value from a single element, the user needs to do about 4-5 clicks. There are no shortcuts so even an experienced user cannot do this faster. I don’t have any proposal how to make this more fluent, but it would be great to reduce the clicks here!
  2. Once the quantity measure is active, each change (different type of measurement, adding/removing from the selection set) it is required to click the “Calculate” button again. We believe this should just go automatically. Only in the situation of a very large selection would it take a long time to calculate these values … But aren’t they pre-calculated and cached?