There are five extension settings. The first is labeled "Maximum number of levels to allow replies". It sets the last nesting "level" at which replies can be made. The purpose is to help prevent replies to replies to replies [etc] that result in a nested tree of comments that is all but impossible to display or read. The default value is 3. (i.e. Comments at the first, second, and third level of nesting may be replied to, but comments at the fourth level may not.)
Note that this setting does not affect anything involving your templates. It works only on the backend. Thus, to control the display of a comment reply form in your templates, you might do something like:
{ if level < 4}[display the comment reply form]
{ if : else}<p>Sorry, you can't reply above this level.</p>{ / if}
The third extension setting is labeled "Number of hours to retain cache files". Cache files and subdirectories older than the number of hours specified here will be cleaned up periodically.
The third extension setting is labeled "Delete the database table on extension deactivation?" This setting determines whether or not Weever's database table is deleted when you disable the extension. The default is "no" so that comment nesting information isn't lost if the extension is only to be temporarily disabled.
Fourth is "Auto-create titles if not specified?" If set to "Yes", Weever will automatically create titles for each comment if one is not specified by the commenter. The title is created by using the first words of the comment. You control the number of words to use with the fifth setting, "Number of words to use for auto-created title".