About [[MediaWiki:Changecontentmodel-title-cantexist/en]]
What is $1 here?
It's just the title of the page which isn't allowed to exist. I added this to the qqq page.
Understood.
Would it not be clearer to say something like: "You cannot create special pages [in the usual way. You would have to do so by programming | adding program code to MediaWiki | supply an mw:Manual:Extensions to mediawiki | ... ]"
Or: "Page creation is not possible in the "Special" name space."