Unfortunately, this is a limit with our new forum software and there's not much I can do about this inability. That said, I have asked FreshDesk about this ability and if it's on their roadmap for the near future. I will get back to you with their response on this soon. I'm also lacking the ability to split a comment/reply to its own topic which is something I really need since customers seem to reply randomly sometimes.
Not creating a new topic.
Give an option to quote a post.
Example there are 10 posts in a topic and I wan't to reply to the 3rd post, it would be easy to quote that post and reply. Instead of using @ to address that person.