Google allows website operators to configure how sensitive they want v2 or v3 to be, but in practice it makes little difference. The only apparent effect on v2 is that the least sensitive setting permits the use of the noscript version. The least sensitive setting of v2 will still harshly hassle and punish users who aren't in compliance with google, unless they use the noscript version. Then and only then, it lets people through for correct answers every time.
