let me see if i understand out moderators though... in addition to what Talaran said, i think:
they need to understand that law is law, but law over grace is not the best way to go sometimes, so sometimes its grace over law. not like bending the rules, though, more like not get happy with the ban button.
they need to be as impartial as possible. more so the better. this is the kind of place where opinions can start [forum's]World War, so it is important to understand that everyone will agree on everything and that just because one opinion is different from another, it does not make it the right or the wrong one. as a bonus, they need to understand that if someone feels their opinions are disagreed, criticizer, flames, etc, then this cannot be overlooked by the offended person-people hold that if their opinions are offended, they are personally offended as a result because their opinions are as much a part of them as their head, mind, etc.
they need to understand that conflict resolution, which might need to be done here, is not as easy as assign ban or warn. meaning, play the mediator is a going to have to take place eventually.
and of course, they need to be accessible, relate-able, show they are people, too, not just BanHammer wielders. one can't moderate the community without being a part of it, which means being accessible, friendly, understanding, etc. example: i'll never forget how one of the moderators said i need to go over there and clean up their screen because the picture i showed them made them laugh while drinking coffee and now there was coffer all over the monitor

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and of course, they need to be witty, clever, quick to find stuff, know where to point you for this or that, and so on.