When will Blogger provide me with the option to block an abusive commenter, from my blog?This is a request that simply cannot be fulfilled.
The issue of blocking individual commenters won't be solved by a new Blogger feature.
- It's technically impossible.
- It's contrary to Blogger policy.
Any abuser of Internet services (aka "hacker", "spammer", or "troll"), with any ability, knows how to create multiple Google accounts without effort. Blogger Engineering is unlikely to spend time developing a new feature ("Block this comment publisher") that will simply provide you with a false sense of security, have no effect in the long term, and require an unproductive use of their time.
If you realistically feel that a comment publisher represents a legal and physical threat to you, you should report the threat to your local police agency. Other than physical threats, Blogger regards comments as a "freedom of speech" issue. Comments published on your blog are jointly the property - and the responsibility - of the comment publisher, and you.
As the blog owner, you are allowed to choose which comments publish, or remain published, on your blog. You can moderate before, or after, comments are published.
If any comments offend you, moderate or delete them promptly. Concentrate on publishing your blog, and ignore the abuse. Eventually, the person abusing you will get bored, and move on.