All members of the team are trusted. Although, I see what you mean. Professing an expertise on a subject can only go so far over the Internet. I believe people will either be interested in following the advice our team members can provide or not. As far as moderation tasks, this goes hand in hand with having the security permissions to essentially perform those types of tasks.
If you are wondering how the site is governed through moderator rules and guidelines, they are available in PDF format here:
http://windowsforum.com/docs/010modfiles-secure.pdf
Admittedly, this is quite complex, and traditionally, we have worked in close circles to help new team members with these issues and to explain why these rules were formulated. And, yes, the language and reference to the site does need to be updated, but the material is essentially the same.
In the past, we have had three tiers of moderators, and we would probably bring this back again were we to receive new applications for joining the team from many people simultaneously. Not every team member will have every answer, and it is really the people who have dedicated large amounts of content and responses to people on the website, who continue to respond and help others, that make a difference in our community.
As for vouching for the advice of others, I can say that many of our volunteer team members, past and present, have been consummate professionals. Every member on the team that we have today can be trusted to give sound advice. No one here is perfect, however, and this should always be weighed by whoever is asking for assistance and whomever is receiving it.
People can be judged by the level of detail and effort they have placed into the content that they have created.