I would love to see a link specific nofollow option. Adding nofollow to some internal links helps to control and balance PR which in turns helps with search engine ranking.

For example, a current link to a contact page might look like:

[/contact Contact]

A proposed nofollow option would look like:

[/contact Contact type="nofollow"] or
[*http://whanethewhip.wikidot.com/contact Contact Me type="nofollow"]

If the addition of more text in what would normally be seen as anchor text conflicts with the existing anchor text, then it might be easier to add the option at the beginning of the URL much like we add a * to indicate a new page. In this case maybe something like a # sign:

[#http://whanethewhip.wikidot.com/contact Contact Me]

By default all links should be follow (as they are now) and the type tag would only be used when one wanted to cut off PR to an internal or external link.

By controlling PR output, PR can be retained on more important pages and restricted on pages that don't need to get ranked such as a contact page, a staff page, links to nav pages or the admin page, etc…