Hi.
This is only a suggestion I think it could be helpful for us as users and for you as technical support.
It would be to add a pair of buttons to allow users to express how helpful was a thread and its posts, even if the thread is closed.
One thread button like "I have the same question" to indicate that the user had or have the same question.
One post button like "This have helped me" to indicate the user found the content of the post useful for him.
This way users can highlight which subjects or issues they are more interested in, and which answers helped them. This would also serve to thank the post writer for its support, even if the thread is closed. I have found myself many times wanting to do this but with a closed thread it is impossible to thank the writer.
On the other hand, you would have a great tool to know which issues are affecting more people, allowing you to prioritize efforts.
Best regards,
Juan Pablo Novo