BuddyPress.org

I’d like my users’ profiles to appear on the root directory, which is achieved with the BP_ENABLE_ROOT_PROFILES directive. Great!
Now I’d like to have the blogs they create exist in a subdirectory, such as example.com/blog/[blog name]

The way it’s set up right now, the blog [blog name] is hijacking the profile of the user with [user name] where [user name]=[blog name]

Ideally, I’d like to configure things to match a non-WP site I set up, where each user automatically has a blog set up on registration, located at example.com/[user name]/blog
But
1) I suspect auto-create a blog is a bit complex
2) I can handle old URLs with some mod_rewrite magic

So any way to set up new blogs in a subdirectory, such as example.com/blog/[blog name] ?