Is there a way to make an already existing thread in Digital Goods to "self-moderated"

I know you are able to do so when you make a new thread there (additional options), but my current thread has over 500 posts that I don't want to lose, it does not give me the option when I edit it.

Thank you,
Dabangg

Note: This is due to people spamming my thread every week




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Edit:
I found this post from 2013, wondering if it is now possible with the forum upgrade?
https://bitcointalk.org/index.php?topic=152876.0