Changing status of an Idea and entering a private or public comment are two separate actions. Today, status can change and no comment is sent to the submitter because we forget.
I'd like to see the Comment screen automatically come up/prompt anytime the Idea status is changed. It would also be nice if the comment screen already had a canned response that can be further customized by the Product Manager.
Automation for ideas is now included in two subscription plans: Aha! Ideas Advanced and Aha! Roadmaps Enterprise+. We also added the ability for automation rules to post an admin response to an idea based on a status change.
We will keep tracking this idea for a prompt to enter a manual comment.