I see you linked to that in your node now. Sorry to reiterate. Asking a member of the group for advice on joining before messaging a whole might not be necessary, but it would be polite and possibly helpful.
My position has long been that I won't add somebody to a privileged group unless they have somebody active from that group (and gods belong to all groups) who agrees to mentor them (along with the documented requirements). In the case of pmdev, I guess I'll have to define "active" very loosely since jdporter can't mentor everybody. :)
Anyone interested in joining pmdev should demonstrate an eagerness for tedium and frustration by actually finding old discussions about how the work of pmdev is done.