I admin another forum and am membership sec for it too (Though I'm trying to drop that one )
We have ranks for forum members - basically as Kevin has a red Administrators title, we have admin, club members, mods, committee members all in different colours - but it is a chore keeping them up to date - and I have access to the membership database!
Unless the forum has "hidden" areas (Which I've no doubt it has for at least the admins!) from certain groups, then there is little point going to all the trouble if its manual process.