The criteria is very simple, every morning I wake up and I find messages from the same 3 or 4 people who contribute to the forum by reporting issues within individual threads or spam.
To me that's an indication of the willingness of those people to support the community and the smooth running of the forum.
As usual I find it slightly disappointing that every time a decision that benefits the project and the community is made, somebody sees evil in it... But I guess that's just me not being an engineer
About Uwe, I've already wrote it in another thread... he already moderates both the german and italian board on top of contributing to the english language board from time to time. He wrote thousands of messages, he just requested a different account for his moderation duties..