Hi Mike,
At the moment each discussion belongs at the individual work item level. However, that would be a great feature request! I recommend posting this feature request on our Community Forum using the link below:
https://success.clarizen.com/hc/en-us/community/topics/200269468-Share-Your-Ideas-Suggestions
As other customers add their comments and support for the request, it will increase its priority. We will also provide status updates via the community so that all customers have transparency around the request.
Thanks!