Currently we have some working group forum categories that are private unless your forum user is assigned trust level 2.
Here are the current stats for the number of users we have:
Here is the documentation for what those trust levels mean:
So I think people should be automatically becoming trust level 2 if they contribute on the forum. I just wanted to make sure everyone was aware of this in terms of access to the working group catergories. We can also manually make people trust level 2 as we have done already.