Quoting Mike Higashi (mhigashi@gmail.com):
A post from 2009 that may, perhaps only partly, answer your question. I've edited it to include the extra spaces that Rick used in the original post.
Thanks for the suggestion, Mike. It remains a small puzzlement, I think.
(Anyway, I do think de-restricting rickd is clearly in order. Whatever occasioned those measures, we're long past that.)