Reported before? I have to admit, that I do not use the Area Tool, but there is room for a small improvment IMO.
Imagine two elements that you want to measure, none of them selected.
1. Pick the Area Tool and click one element and you get your measurement values.
2. Now try to click the second element with the Area Tool ... ... ... not working. The first element stays selected.
To get the measurement of the second element you have to e.g. change to the Move Tool and then back to the Area Tool to measure the second element. Two actions too much.