Hi @mpbraendle,
Looks like there was some previous discussions about this here: CC other users on Editorial Decision emails - #5 by RickMath
And, there was an effort to move ahead with this despite the risk that editors may reveal an author’s identity: Re-add "blind copy reviewers on editor decision" feature · Issue #4834 · pkp/pkp-lib · GitHub
I’m not sure about future development planned around this - @asmecher may wish to speak to this?
-Roger
PKP Team