Add functionality to whiteboards to allow for use of designer as a wire framing, process mapping tool.
As a UX designer, I make use of designer to create wireframes and ui mockups. Whilst more specific tools exist I prefer the ease of use and quality that designer offers.
For use as a UI tool, it has recently made some great advances, a useful feature however would be to link artboards together to show the links between CTA and destination targets.
Another way of doing this would be to have a parent dartboard that thumbnails of the other artboards could be included. This would allow the creation of advanced process flows.