LaVey's books fill in all the areas on Satanism that we need. Other respected Satanists have written books that enrich us and add fuel to our fires. For anyone other than him to write 'The Satanic Warlock' would be an injustice, and if he had wanted to have written it he would have.
I agree with all of that except the part about injustice, but one man's homage is another man's plagiarism, I guess. Would you react as strongly if another title was used for the same idea?
Just my opinion, but if you think something is really lacking in Satanic literature and you want to write an essay on it, go ahead and see if it becomes a recommended piece in the world of Satanism.
I suck at writing. I'm too concise because I never have lots of things to say about something. I have one thing to say, say it, and shut up. Works for message board posting, but that's all.
This 'there should be' talk keeps making me think 'well who, exactly, do you want to write it?'.
Someone other than me.

But seriously, my level of emotion around this idea is pretty low. I was just thinking out loud about something that would be cool if it existed. "Should be" is too strong. "Want" is too strong. But someone who's casting about for something cool to write about might be into this idea and run with it, adding something good to the world. If someone takes this all the way to publishing, I'll be a paying customer.