Needs an undo step, a little bit destructive and risky to use this tool.
I know the next one will ask for the length of the border, or the number of colors in the selection, or...
I'm quite often do measuring the size of an area in an image (1:100 drawings). And I'm happy that pdn shows this value. I'm just missing the distance between two points. And it would be nice to use the same non-destructive tool like for the area. Area size is also a bit special.
As I said, it would just be handy.