A_O_C I can't expand too much because at this time I'm not completely familiar with the admin side of phpBB3.
I can't comment on what I don't know, and I will freely admit that my exposure to phpBB3 is lacking. This is an excuse to dig in and learn as much as anything else.
Plus, as I said, folks that have used phpBB2 have requested that I update it for phpBB3, so I assume there is some need for it.
One of the other things that this MOD did that I don't think is in phpBB3 is the ability to set a min / max post count in addition to the auth level. So a board owner could say that not only do you have to be registered to view the member list, you also have to have at least 30 posts.