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In 11.4, when someone enters a question/comment, that information is sent to the technician assigned to the change request ticket who can respond to that user. There is no way to send that users question/comment to everyone involved.
There is also no way to suspend a change request based on a certain type of comment. My guess here is the person making the comment would likely not approve until they receive a sufficient answer so the request is paused essentially.
As for a final ruling based on the comments, the only way to do this would be to include a person responsible for reviewing all the comments so they can provide final approval always.