If I click decline, it will shut down the pull request. If I make some comments then leave the pull request open, it will stay in my inbox. What I would like is a button that means I don't think the code should be merged yet, but I don't want to shut down the conversation for other code reviewers, and I don't want the pull request to stay in my inbox.
Is this something that already exists? Or would creating this button with a plugin be difficult?