Allow roles

Many groups have members of different kinds, such as teachers and pupils, or gurus and n00bs, or researchers, patients and caregivers. In such cases it can be useful to make those groups visually distinct - especially in situations where a mix-up might be harmful, as in a non-caregiver posing as one and starting to solicit private information, or a non-teacher prankster giving false instructions.
Currently a work-around is possible using flair, but if room administrators could simply assign members to the various classes, that would be much better. Once communities are there, as 'super-rooms', such assignment could also be done on that level.
Remark that this is fully orthogonal to power levels - though once those become multidimensional, one of their dimensions could be used to indicate roles.
Ideally the roles should be visible in the list to the right - which might even be sorted by role, akin to the way tags sort the room list to the left.