I just just purchased QCAD professional with the belief, that there's a tool to automatically calculate the area of a closed polygon. But after installing it I realised, that I still have to click the corners of the polygon manually. This is pretty annoying, since I've many drawn polygons of which I need to know the area. Just selecting their contour and getting the result would be much more comfortable.
I'm sure this is technically not such an tremendous task and would like to see it implemented. That was my main reason for buying the professional version, my other needs are covered by the community edition.