In the admin there is the option to turn off field validation. But even with this option set to "No", when editing fields or saving the user, the Ajax username check and the Ajax email check will do their validation. This is new in CB 1.4 and was not present in older CB versions.
I don´t think this is intentional. Turning off validation in admin area should turn off all validation otherwise admins option to override any erroneous are limited.
Or is there already a way to turn of Ajax validation as well?