On the subject of graphics export it would be great if the image was the size of the Visio page, not just the size of the contained elements. If one or more elements are selected then those are the elements that get exported, is that by design? It's usually something that happens by accident.
Also higher quality output, as well as access to the settings from the API.
Also, also, the export API doesn't seem to be unicode compatible.
Also, also, also, export should be a separate menu, not lumped with save, you can't restore from a gif file. I've known several instances where someone has created a drawing, done a save but selected GIF or something then is all upset when they've lost all the Visio part of the diagram.