User settings can only save password and text to DB
The user settings module has its own configuration.
The property 'table' => 'be_users' allows to save the value of a field to DB in addition to saving it in the UC array.
This currently only works for types password and text, because only for those an additional '[be_users]' is added to the form input element property "name".
I do not consider this critical enough to port the bug to 4.x.