Classes/Levels of Moderators?

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Hi there, no this feature is not included and not planned I think one level is sufficient. For example SO has only one level and very few moderators. You should not discount "mental controls", they actually work quite well :).

Btw, increase karma gradually opens the moderation rights of regular users and the individual barriers are tunable in the "settings". Settings are available only to site admins, moderators cannot access them.