Last year, I sent some patches to Scaladoc. And last month, I got a commit bit for Scaladoc (a part of the Scala repository). Thank you Gilles Dubochet and Martin Odersky for the offer.
Current Scaladoc is not "perfect". This is why Lift's API documents and Scala's documents are very different from each other. Lift uses VScaladoc instead of Scaladoc. And another notable alternative is Extradoc. Both are great and competition is good thing for the Scala community.