I think you might have misunderstood me, we are putting together pieces like that in S+S. If you were to go take a look at @jfuji's blog you'd see a few there already. Guides to grammar, how to effectively structure stories, there are all kinds of ways we can improve our writing, though perhaps the word "tutorial" was a little misleading...
I mentioned in the comment above that we are aiming for Scholar and Scribe to remain focused on creative writing, so another location to post that kind of content to help writers improve, or source work, or other functions that aren't strictly creative writing would be awesome.