Thanks, Hugo. I've left a comment there.
It's too bad you didn't include the information that the anonymize option does not affect Hiawatha's banning features. It may be obvious to you, to most people will rather be familiar with tools such as fail2ban, which is crippled if the webserver writes anonymized IPs to the log. Well, perhaps it is obvious, since fail2ban does not get the page request, and thus has no way of getting the IP other than from the log, but I still think it would be worth to mention.