In this version, we have implemented a new permission - Skip limit check if already posted in the thread. When the permission is enabled users will be able to post a reply in a thread without any further limitations if they already have a post in that thread.
The permission is per-usergroup and per-node, so it can be customized for an entire usergroup or for some specific nodes only. By default it is disabled and product's behavior is the same as with 2.0.x version.
Please consider posting a review if you are using the add-on and let us and other users know how it works for you.
Thank you!