Perhaps something for future versions of Xara:
  • Allow users to specify custom ActionScript in Flash animations. For me that would do the trick. I have done ActionScript programming in the past.
  • Take a look at JessyInk, a nice solution for slide shows with SVG and Inkscape. It allows creating resolution independent slide shows that run on a large number of web browsers.
  • Also take a look at Adobe Edge, another solution for interactive SVG based presentations for the web.