This would be useful, in case the person is creating a post in another area of the forum and wants to fetch several quotes from other posts, without having to open the pages of these posts to generate the quote.
Yes, that would be useful, but it should be noted that this is an archive and not a live version of the forum. Topics may be moved, and posts may be deleted, so there is no way for ninjastic.space to determine whether a generated quote will be valid or not. They can very easily lead to dead links, so it is better to create quotes the old-fashioned way.