Comment 2 for bug 592418

The feeling of the line tapering could be mimicked by line markers (arrows). The appropriate file (e.g. /usr/../share/inkscape/markers/markers.svg) must be supplemented with appropriate "arrow" definitions like:

    <!-- Sharp ending -->
    <marker style="overflow:visible" id="Sharpstart" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Sharpstart">
      <path transform="scale(1) translate(0,0)" d="M -10,0 C -7.8,-0.31 -3.4,-0.45 0.01,-0.5 L 0.01,0.5 C -3.4,0.45 -7.8,0.31 -10,0 z " style="fill-rule:evenodd;stroke-width:0.62500000;stroke-linejoin:miter"/>
    </marker>
    <marker style="overflow:visible;" id="Sharpend" refX="0.0" refY="0.0" orient="auto" inkscape:stockid="Sharpend">
      <path transform="scale(1) rotate(180) translate(0,0)" d="M -10,0 C -7.8,-0.31 -3.4,-0.45 0.01,-0.5 L 0.01,0.5 C -3.4,0.45 -7.8,0.31 -10,0 z " style="fill-rule:evenodd;stroke-width:0.62500000;stroke-linejoin:miter;"/>
    </marker>