1. I will be keeping all comments screened on posts with the beta tag, including my replies to your replies. Which, FYI, apparently means you can't reply to my replies on the same comment thread. It may also mean that you won't see my replies unless you have email notification on. Except this post, so any discussion of the issue can be public.
2. If you take the time to read a beta-locked story but don't have any suggestions to offer, comment anyway for proper betareader credit.