I find it a bit hard to swallow that the site-wide copyright footer link is not nofollow.
In the age of massive Google penalties Penguin, Panda etc. it is not doing Woltlab or its customers rankings any good.
Site-wide footer links have on numerous occasions been called out by Google as manipulative and will get both parties a penalty sooner or later.
Please make it nofollow asap, there is no valid reason not to change it.