Arrowheads is vital for my work as well. I have produced a lot for content in Inkscape with this feature and it doesn't import. You can't produce curved or dashed lines with the arrowhead tool limiting its usefulness. While I'm at it, it would be really great to see ellipse arcs that can be edited as well. You can get someway there with the Pie tool but again no dashed lines, arcs cannot be imported from Inkscape and no arrowheads (when this feature appears). I bought Designer because I was so impressed with the speed and functionality of Photo and assumed that it would similarly have all the standard tools in place. Now it is going to have to sit on the shelf for another year while I struggle along with Inkscape. It is such as shame as Designer is so much better than Inkscape in so many ways and I really want to use it.