RCPSC,
The main purpose of this script master series is to demonstrate the possibilities using Custom triggers. Hip Chat integration is one of the most asked integrations, hence we have decided to post this. Using this integration, only a notification will be posted to the specified group and no chat-like conversations are possible.
I agree that the chat feature is pending in our application. Currently, it is in the Implementation phase right now (You can see the progress in our Roadmap). Since it requires intensive testing, we are sorry that we cannot specify a timeline for this as of now. However, will keep you updated about the progress on this.