Ok I made an extra function which you can all use to add extra information to an item. You can create the function in your template function.php and the plugin will be able to use it.
[b]IMPORTANT:[/b] You will need PHP skills/MYSQL skills to make stuff on your own. If you do stuff wrong your site might stop working.
More information can be found http://wpaffiliatefeed.com/forums/?vasthtmlaction=viewtopic&t=92.0