Ok, I finally got it to work in both IE 6 and FF 1.5! This mod enables you to sort the items in the menu tree by dragging them by their handles. The documents involved will get new menu ids based on their new order. It is partly based on Scriptaculous, a free javascript library.
Installation:
1. Make a backup of "manager/frames/3.php" by renaming it so something else.
2. Download "DragSortTree.zip" and extract the 3.php-file and the scripaculous-folder to "manager/frames".
3. Enjoy!
Please have a test and leave a comment. I’m really looking forward to read other peoples thoughts about this.