Тема: Need a plugin about duplicated discussions (Paid request)

Hello all,
I'm trying to create a glossary script with punBB, so every topic in forum must be unique. I need a plugin that can check if the topic is already created or not while user trying to post new topic. If that "unique term" already exist in database, than make  the post _new answer_ in existed topic, if not, create the new topic. Is it possible? I'm ready to pay some bucks for such a plugin. Please PM me if you are interested. Thank you.