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We've been chugging along a few weeks with only 3 Global Moderators, and I don't think too many people noticed that Salty, and grue were inactive. Salty as been logging in, but hasn't done too much moderation work based on Hilariousnadco's comment. theymos recently made a comment that its not about the budget of the forum, but the lack of trust in delegating roles to users. So, I don't expect us to see new moderators/global moderators, and would assume that existing staff members will be promoted if there is a need.
Yeah, I have read comments about the budget not being the issue rather than lack of suitable candidates. It does seem like a lot of work for 3 people so I hope there are some moderators in line for a promotion soon.
In general, all Global mods do is help the moderators handling reports. Some global mods will also help with administrative duties such as temp bans, account recoveries and the like.
If there are sufficient section moderators, having additional global mods will not be necessary.