I second the thought that Tutorials should be wiki-like.

In response to the original quesion though, I think that approvals in the same way as SoPW would be fine. Limiting who can post a certain type of document, or enforcing a particular process seems a little against the "way of the monastery". Requiring an approval, however, is perfectly in keeping with existing practices (and a very good idea for stopping spam before it starts as you mention).