I wrote:
phpBB allows posting without registration, and the admins could be registered users who are also moderators on the board.
^^^^^^ mediators/arbitrators
I should also add that phpBB, and some other forum systems, include built- in poll systems. This way, we could have an open discussion, but the poll could be closed to mediators/arbitrators and would be easy to use (polling via email is a PITA).
Regards,
Erik