? comment_timestamp.patch
Index: modules/comment/comment.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/comment/comment.module,v
retrieving revision 1.630
diff -r1.630 comment.module
744c744,746
<         $edit['timestamp'] = time();
---
>         if (empty($edit['timestamp'])) {
>           $edit['timestamp'] = time();
>         }