Nice thread and overall solid structure however, there isn't a need for admin assistant or ban appeal assistant in our current hierarchy just isn't a need. Staff required duties are in game and forums all other outside resources such as irc, discord and etc is not required, which would be the same for streaming services and social media sites. Although, not required I don't have a problem with staff managing/overseeing such sites providing that their production doesn't drop.
Here is the current Staff structure(sorted by alphabetical order):
Management
Admin
Dev
Group Leaders(under certain circumstances)
Content Staff
Artist
Content Scripter
Mapper
Community Staff
Community Coordinator
Game Master
Trade Moderator
Pre-Staff
Apprentice
Later, other groups will be added(battle mods) but we really don't feel the need to over do it and give staff extra duties.