Is it possible to prevent users who are not part of a project (say 'Engineering', for this use case) from approving Differential revisions? We'd like them to still be able to view and comment on the revisions, but their 'Approval' should not count as far as allowing the developer to land the code.
I guess we could achieve something similar by having a 'Blocking Reviewers: Engineering' on every diff, but I'm not sure if that's the best way to go.