In the LLVM project, code reviews always need to go to one of 2 public mailing lists (either llvm-commits or cfe-commits). The problem is that people using phabricator often forget to add one of those lists, which is the primary way how other developers discover and follow code reviews that are going on.
It would be great if we had a way to configure that if somebody creates a patch without cc'ing one of the lists to pop up a window saying "you did not add llvm-commits or cfe-dev as subscribers - do you want to do a private review?"