The iManager interface does not allow for a quick user creation workflow. Basic fields that should be common are not part of the user creation or readily available on the the Identification Tab. Example Mobile Number is very common these days. To be forced to go to the Other tab is a very slow process for redundant user update or creation activities. Another Example is Country, on the Postal Address Tab. Country is very common in this an international world.
Allow the ability to add fields to various tabs to optimize administrators common tasks. ConsoleOne/NWAdmin used to allow this as I recall.