Anonymous posting needs to be guaranteed to be absolutely anonymous! I don't think a moderator should be able to deanonymize anybody, threaten to deanonymize, or even figure out who is posting! This is extremely important for academics to be able to post questions, answers, and especially reviews.
This means moderators need to pledge to treat anonymity as sacred, never deanonymize anybody, never try to figure out who is who from statistics or IP's, and to make efforts to not even look at the IP's of legitimate anonymous users. Anonymity needs the firmest guarantee, a single well-placed deanonymization can wreck an academic career, it is not funny.
Also, for this reason, one might need to make sure that no academic folks are allowed to look at IPs of anybody, they might deanonymize someone. This might restrict the moderation pool unduly, but the only other option is to store the IP's encrypted from the mods, which requires programming. I think this is a serious issue.