Now i'd like to represent to you a new 7.x-1.0 version of Comment mover module! Today, it has an alpha version and it may have some bugs, but it works correctly on my drupal site (i'm using an Advanced forum as well), so, feel free for using, testing and posting issues if something is wrong.
6.x version is not supported, i work only with 7.x branch. If you want to participate and become a co-maintainer of 6.x or 7.x version, please, post an issue here. Description
This module allows you to move comments around.
You can either
a) move comments below other comments on the same node
b) move comments to another node
c) convert comments to a forum topic (or to other node types)
d) (planning feature) convert nodes to comments
In cases b and c, the original comment can contain a link pointing to the place where the comment is now.