one "feature" is that the minimum edit set is username, lastname, and one of the additional cb profile fields. Basically this is because last name is in the users table along with user name and the other fields are in the cb comprofiler table.
I will probably do a major change to the code in a few weeks. The code still uses the MD5 password hash. However, because of the upward compatible code in Joomla 0.13 that is not posing a problem. I have no plans to support any flavour of Mambo.