mark threads as unread manually

What variant of Codex are you using?

Codex Desktop

What feature would you like to see?

Please allow us to mark a thread as unread manually.
When managing many threads, this would be very useful to be able to mark threads which still need some human interaction. Otherwise I tend to forget, re-prompt later and waste tokens.
For example, I sometimes click on a "review" thread which marks it as read, create a new thread to fix a specific finding, then forget there were more.
One workaround is to send a short message just to mark the thread as unread, but it also wastes tokens needlessly and pollutes the context.

Additional information

_No response_