Limit threaded depth

This can already by done through the theme layer. The indention of comments is actually created by design, usually CSS. All you have to do is theme all comments under the first layer the same way.

I think the OP meant differently. CSS changes the indentation, but can't change comment order.

That would be a nice option. Though I am not entirely sure it belongs in this module. I will have to think about that. Feel free to express why you think it should or should not be in the flatcomments module.

The purpose is to allow maximum N+1 levels of comments. With this module, N=0. However I don't see other module does that, and there is a need for N > 0.

The principe, when you reply to a comment, it check if the parent comment has a level > N, it will descend to level N and change the parent of the new-submitted comment to that comment. Let's take the example given by the OP, when we add cid7, if N=0 (current), its parent will be set to NULL, if N=1, its parent will be set to cid1, if N>=2, its parent will be kept unchanged (= cid3).

Flatcomments actually set pid=NULL to limit max level = 1, but it can do that in a more general way. Moreover, it requires just a small modification.

I understand what you are asking for and agree the feature would be great.

My disagreement is that extra options to for "threaded" comment configuration is not really in the realm of a module that is named "flatcomments" and gives extra options for "flat" comment configuration.

Why we should implement this feature in the module?
- There is a real need: for forum-like discussion we need flat comment, ok. But for blog, we might need N-level threaded comment.
- It's easy and just a small add-on to this module
- If flatcomments doesn't support it, there will be another module does it (or clone, frankly). That module does of course all flatcomments does. => duplicate effort.

Please stop changing the status.

You need info. I give you you info, thus I'm expected to change the status (because it has changed, indeed). But I'm sorry if it causes a problem for you.

I need this feature again in another project and release a new module http://drupal.org/project/tlcomment.

Drupal core issue about limiting comment depth.