The ability to cancel last point when drawing an area load, deck assignment or mat foundation like you can in RAM Concept. It's especially frustrating when drawing a mat foundation and you accidentally click the wrong point and have to start over since there isn't the ability to go back and adjust the polygon.
I just let the point be in the wrong spot, finish what I was doing, and go back and edit the polygon. The cancel last point option like concept would be an improvement.