So, in other words, the Oubliette is for threads that have been closed for various reasons but can still be viewed. We don't delete threads in the same way Librarians don't burn books.
Siberia is for threads that are not necessarily in need of closing but do need a time out. They need to chill. Its humorous to have a thread discussing penalties in our subforum devoted to threads that are bordering on penalty infractions.*
Finally, we have the Crime and Punishment area devoted to actual crimes or infractions.
Can you make threads in the Oubliette and Siberia? Yes. Should you? Probably not.
*Yes, I make choices based on Teh Lulz sometimes.