Ideally, such an addon could maintain a database of such names, and simply sort them when those individuals are in the raid into whatever group is appropriate - have a 5th section for unsorted folks and let people sort those as needed.
That was my thought... the database would be local to your account of course (although being able to share/sync might be nice). Logically this could/should be built into ORA (since we're talking ACE here).
Having another addon where you could create lists of character names and categorize them (tank, healer, ranged dps, melee dps for example) and then have raid frames use those groups would be awesome. Especially for healers and tanks there is no way to create such a list automatically and you would need to manually create the lists. I always though something like that would be awesome!