WoW Keyboard Helper (WKH) is an app that helps you to avoid the WoW Client v4.3.0 (Mac) bug with keyboard layouts.
IMPORTANT: WoW Keyboard Helper does not change WoW Clients files or memory. It changes nothing in WoW Client.
IMPORTANT: WoW Keyboard Helper needs "Enable access for assistive devices" option to be enabled. To enable it, go to the System Settings -> Universal Access and check the corresponding checkbox on the bottom of the window.
As you know, WoW Client v4.3.0 (Mac) has a bug that discomforts normal gaming. If you switch your keyboard layout to anything but U.S. layout (in-game chatting in Russian, for example) then you cant control your character, because outside of text fields the keys you press are interpreted wrong.
WoW Keyboard Helper is a keyboard layout switcher that will affect only WoW Clients text fields (chat, search, auction etc).
So, you set your system keyboard layout to U.S. (thus youll be able to control your character). And when typing in WoW Client text fields, you use WKH to switch between keyboard layouts.
Any layout listed in your systems keyboard layout switcher menu are supported.
Detail information can be found on the apps site: http://wowkeyboardhelper.com