As per what Rani said, most of those 'not allowed' works and artist can be found in the section they are most relevant in.
Opening a new section of Forbidden works has its pros and cons actually, but I do know it will be quite similar to having a stickied thread in a section. Like the stickied rule thread, not everyone will go in the Forbidden Works section to check what is not allowed and still post a new thread in the download section. Whereby, if there's a Forbidden prefix marked thread existed in the download section, then the people know they cannot post a new thread there.
I am sorry about loverlie's deletion of thread, she has PM-ed me that she has recovered back the threads and locked them instead now.
As for the providing links to the artist or scanlation website, it can be shown on the same thread that is locked.
What I think we can do is take AlexiaLee's suggestion of making the list (the thread) more visible and make some small changes to it. This should be sufficient compared to just making a new section for Forbidden Works.