Comments via web hook
We are currently starting to use Teams to publish automated notices into Teams/Channels about certain business events that may occur (to reduce amount of emails that are forwarded around). Currently our Java/AWS application environment is doing this via the JSON payload to a web hook URL.
Would also find very useful, the ability to post a comment via the same mechanism. This way updates to the event can be given as comments on the original item, rather than new posts.