Version: 4.3 (using 4.3.1 (KDE 4.3.1), Debian packages) Compiler: cc OS: Linux (x86_64) release 2.6.30-2-amd64 kaddressbook allows to define custom-fields. It is not possible to define a custom field with “special”-character like äöüß–. This is on purpose as the input-field does not allow to enter them, but it should be possible to do so.
Thank you for your efforts you put into this bug. kab3 has long been deprecated, and so I close its old reports. If this bug/wish is still valid for kab3's successor kaddressbook in any recent version (5.0 or later, as part of KDE Applications 15.08.0 or later), please file a new bug against kaddressbook.