Quick solution :
http://www.joomlatune.com/forum/index.php/topic,2020.msg8176.html#msg8176Regarding you image. With plain list we have no problem to reverse order for comments but with tree view it could be not very useful. I'll try to describe my point of view (but sorry for my english).
In default order we have some comments tree:
1. This aricle is good and I,m wait for continue...
1.1. Yes, I'm agree. Its very interesting
1.2. No, it isn't so good
1.2.1 Why?
1.2.2 Because it has too much errors
2. No, it's a boring article.
In this sample all comments are sorted as they were posted. If we reverse order we will have:
2. No, it's a boring article.
1. This aricle is good and I,m wait for continue...
1.2. No, it isn't so good
1.2.2 Because it has too much errors
1.2.1 Why?
1.1. Yes, I'm agree. Its very interesting
The comment 1.2 will be shown before 1.1 and when user reads it he haven't read 1.1 and don;t know why 1.2 is written. I can show more complex example what will illustrate this issue. We couldn't reverse only first level of tree - only whole tree.
But as many users asked me about such feature - I'll include it in nearest release. But in my mind this isn't good solution.