I would like to have a different footer for each article. Well, not really a different one but with different options. For example, imagine I want to put a link that automatically adds the article to Digg or something like that. I want the footer to include a link to digg.com but with the URL of the article as a parameter.
Can that be done?

I would be fairly easy to add variable functionality, e.g. if you entered {AF:ArticleNumber} in the footer, the plugin would replace this with the actual article number. I could probably add a link variable to provide the link to the page too. I will have a look when I get the chance - which won't be for a few days at least.