I think thread deletion and/or post modification should be made a privilege.
I'm sure everyone has seen a few (recent) occurrences that new members/lurkers have come here to ask a SAC or other types of questions, only to delete it after they obtain what they want. People put in some effort to help others out, knowing that it can potentially help more than the one person asking the question.
This is not a considerate act and I'm sure it's not what VN is about.
Hence, I'm suggesting that thread deletion and/or post modification should be made a privilege - maybe 100 posts?
I don't think the post requirement is too much as it doesn't restrict them from posting anything. If they do accidentally post sensitive information, they could always PM a moderator for it to be removed. (Or extend the "report to moderator" function to delete a thread along with a comment on why the thread should be deleted)
(I'm sure this can be done because I've seen it on other forums where members have "levels" for certain privileges. However, I'm unsure of the plugin name)