My biggest concern would be that this gets used to "shadow ban" or "shadow remove" threads from being seen. I'm interested to hear how you define what becomes a helldump thread, but No56 already brought that up.
* Notifications will be disabled on Hell Dump
If someone is watching a thread, they'd expect to be notified as that's the consistent behaviour everywhere else. The same thing for being quoted or being mentioned. I will always be against anything that causes surprising behaviour, and I don't think this justifies it, and could easily be taken out of context as "malicious design to shadowban threads".
* Posts will NOT show up on the new posts list
To me this is the most notable change, but rather than having moderators say what shouldn't be shown in whats new to everyone, I think it'd be much more empowering for users to be able to "unwatch"(yes I know watch/unwatch are already used terms) or "never see this thread in whats new" threads they select. It could be a button next the watch thread and bookmark thread buttons, and the wording could probably be changed for something more appropriate. There's already functionality to bookmark threads to come back to later, and functionality to watch threads for notifications. For me personally, I'd find this useful as some threads(like this Male Insecurity thread) are things I do not want to waste my time on. This would also be useful for threads I have no interest in.
If I've just described a feature that already exists, then that feature is not really visible to the average user, as I have no idea it exists, which then just means it's a case of exposing it better.
This idea is comparable to how you can filter the catalogue in 4chan's catalogue view.
Anyways some other considerations for this:
- Would this apply retroactively to previous locked threads?
- Would previous locked threads be moved to this category?
- Being an entire forum category where new threads can't be posted, couldn't this possibly become a "badge of dishonour" to make a thread that goes there? Would this then encourage some users to try and make threads that are spiky and inflammatory on purpose to get them there? This issue occurs on 4chan to some degree where people make spiky and argumentative threads to keep them bumped all the time.
- Is it actually worth the time and energy keeping threads that become flamewars open rather than locking them up? They are public and permanent records of discussion that the moderators will still have to go through, and check they're adhering to the rules. I'm wondering how much time would be spent policing flamewars that would be a better shortened just locking and not entertaining a colossal waste of time.