Enable and Disable Captcha for posting.
In general, I think that CAPTCHA images are the best current defense against spammers (although I understand that some spammer have actually found an attack on them); however, requiring CAPTCHA for each individual post on a newsgroup configured "only registered users can post", PLUS requiring CAPTCHA for the initial signup, seems to me to be slightly overkill. I'd like a way to be able to turn off the CAPTCHA for posting.