I just noticed that the link in the Editors Nodelet goes to the message inbox for editors, not for janitors. I took a peek at the janitors message inbox and see several non-archived messages that perhaps no one has noticed. Would it be appropriate to have message silently redirect /msg editors to go to janitors and change the nodelet to look at janitors inbox?

Better yet (or in addition), should usergroups have a flag in the database (where?) to show that they are allowed to receive messages?

Update: tye proposed the clever idea of having messages directed to usergroups with just one member automatically go to that member (so msgs to editors would go to janitors). Because it was easiest, I made this happen only when the member is also a usergroup in message - (patch). If this is applied, all existing editors messages should be sql-updated to belong to janitors.