Hi yakas, it is possible to set up a script on a shortcut key that will generate a viewport image but at a higher resolution than the actual current screen. It places the image into the clipboard so you can then paste it into an image processing program.

See here for the script:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1049.5

That should do what you are looking for.

- Michael