It sounds like a good idea for members who need to search the archives. I'll mention it to the Magazines forum mods and see if it's something they want discuss putting in place.
Issues they would have to deal with which might make this impractical or impossible:
- If you can't find all the old threads by doing an advanced search, then they won't be able to, either. But maybe they can do this going forward.
- Someone would have to keep it updated on a regular basis. Mods are volunteer, work only when they have some time and the roster changes from time to time as mods move on. So incoming mods might opt not to do all that extra work or at just forget to update it each month.