Something i've wondered about a few times, never enough to actually implement and test.
If there were two versions setup. One for the homepage with a follow link, then the rest of the site contains a nofollow link.
The logic behind this is the most linked page/visited is usually the homepage (does depend on the site I know) so you get one follow link from the site. Then the links on the rest of the site are nofollow. Is this breaching any google guidelines?
-- Disclaimer -- Whilst I do offer advice, I mainly work within eCommerce. There are plenty of users here who are more knowledgeable about SEO than myself.
Always happy to help in private message.