The measure tool should support measuring multiple lines/features at once. In my use case I have a bunch of discrete but connected lines in a circle. I want to be able to select all the lines and their vertice with a box selector, click measure, and see their combined length.
As a hack: The only thing I have found is to redraw the circle using a spline and then measure that, but that is very time consuming as my circle is composed of 80+ points.
It would be much better if you could select a bunch of lines and it would show you the length of the perimeter.