Time limit on access to revisions

This is a great mod and meets a real need for those using Drupal for Forums (espec. users who have gotten used to vBulletin and such)!

Feature request:
How about adding the ability to close comments to revisions after x amount of time has elapsed?
Like 15 minutes or whatever (maybe admin selectable?).

Some code along these lines has been put together along these lines but I don't know if it works and it's not a module yet... and doesn't look like they intend to do that with it.
http://drupal.org/node/54788