Moving replies to comments?

I have a user who posts all his replies as new comments. I then reply to his latest comment, and instead of replying, he starts another comment. Thsi is all under one post. I would like to be able to thread ths properly becuae otherwise the comments widget fills up with ten instances of this one guy having one thread! This plugin is WONDERFUL for its purpose, but it would be evn greater if it could move a comment to a reply, all under the same post! Thanks to anyone who can suggest a way for me to fix a thread like this one. Thanks for your attention.