Ok I've got sponsored by by ItchyBrainsCentral
and implemented tiny version of this addon.Click here to download
. Study readme.txt file for installation and post any suggestions/notices in this thread.
The addon works like suggested: admin choses the certain date and the script selects all topics with the lates reply made EARLIER than this date, i.e. after this date, no new replies were made.
For example if you specify March 1, 2007 at the time there is April 1, 2007, you will lock all topics which have new reply made as early as on February 28, 2007.
Only available to admin of course.