Though this doesn't apply to me that much, i think its a good idea to allow the following:
Channel VIPs : Access to join the channel when locked (thats it)
Channel Admins: Access to kick and move up to EA+ (with proper reason)
Channel Overseer: Access to Channel admin access and below and access to edit the channel.
Remider, this is just my opinion and i dont have much experience with these but, this just makes the most sense to me personally.