Have you ever wanted to highlight a valuable comment among all others? Or not let that troll 6-paragraphs comment take more space than it deserve? Or even hide a whole thread of offtipics?
Well, now you can!
<a href="http://hikari.ws/featured-comments/" rel="nofollow ugc">Hikari Featured Comments</a> is a simple plugin that adds 3 new custom fields to comments, allowing you to add special properties to each of them.
With this feature available, you can query any comment to know if it has any of those properties flagged, and if so you can take special actions within your theme or another plugin.
<h4>Features</h4>
There are 3 special properties available, you can give them any semantic you like, but default meanings are as follows: 
* Featured: a comment flagged as featured should be highlighted from all others. You can give it special CSS styles from your theme to make it more visible among all comments, and flag any valuable comment as so. 
* Buried: a buried comment is a comment you don’t wanna just delete, but also don’t want it as visible as all others. You can use it to hide offtopic comments which you don’t want to perpetuate. 
* Children/Threaded buried: this one has similar meaning to the former, but it should be applied to nested/threaded/children comments of the flagged comment.
Note that any comment can be independently flagged as Buried and Children buried, therefore a Children buried comment shouldn’t have special styles applied to itself. In the same way, you can also have a featured AND buried comment, having both styles should be applied together!
Hikari Featured Comments provides a special metabox in comment edit page (/wp-admin/comment.php?action=editcomment&c=XXXX) where you can flag these properties, and it automatically attach new classes (<code>featured</code>, <code>buried</code>, <code>children_buried</code>) to comments in frontend.

Hikari Featured Comments

It adds 3 new custom fields to comments (Featured, Buried, Children buried), allowing you to add special properties to each of them.

Jennifer M. Dodd

bbPress Threaded Replies is based on comment-display functions from WordPress 
and topic-display functions from bbPress. Settings can be adjusted on the bbPress 
Forums options page of WordPress. bbPress running as a WordPress plugin is required.
bbPress Threaded Replies is incompatible with the Fancy Editor; enabling threading will 
automatically disable the Fancy Editor.
The plugin checks first in the stylesheet and template directories before reverting 
to the default plugin templates.
<h3>Credits</h3>
Development funded, in part, by Ariel Meadow Stallings and the Offbeat Empire.

bbPress Threaded Replies

Add threaded (nested) reply functionality to bbPress.

Hikari Featured Comments vs bbPress Threaded Replies