• Deleted threads will no longer exist
• Moved threads may be moved from, e.g. the Site Feedback sub-forum to an "Archive" or "Resolved Feedback" sub-forum
• Closed threads will no longer be writeable and remain in the (sub-)forum they started in, but be either filterable so that they appear in the same chronological place if the filter is set to "show closed threads", or displayed at the bottom of the (sub-)forum

Miblo
With these abilities:

• Deleted threads will no longer exist
• Moved threads may be moved from, e.g. the Site Feedback sub-forum to an "Archive" or "Resolved Feedback" sub-forum
• Closed threads will no longer be writeable and remain in the (sub-)forum they started in, but be either filterable so that they appear in the same chronological place if the filter is set to "show closed threads", or displayed at the bottom of the (sub-)forum

Kelimion
Your wish shall be granted. :)
Also, I already have backend support for it, I just need to hook it up to the frontend.