I had an idea that I'll throw out there for any mod author looking for ideas:
- An add-on that affects link parsing:
- If the site has good pagerank, link with a follow link
- If the site is bad pagerank, rel=nofollow the link
- If the site is a bad neighborhood/shady site, do not parse the link.
- Admin panel allows customization of how good a site must be to get a follow link.