I think that, overall, the tuning forum is going to be great. Yes, people will respond with answers that may not be correct, but how is that different than any other area of the discussion boards? I mean, that's the idea of forums: bounce ideas and gather info, is it not?
As far as causing damage, it will just have to be understood that any info on here is not guaranteed. It's not much different than taking advice from unqualified people that shouldn't answer engine (internal) questions or car audio questions.
As long as the forum is watched, I think it will be great. I know I've been wanting one for a while.