Adobe InDesign CS4 and CS5 don't support World-Ready Composer. World-Ready Composer is the GUI-less, scriptable method that enables support for “complex script" languages, such as Arabic and Hebrew.
While the World-Ready Composer exists in InDesign CS5, it has never been marketed as an official feature. Although there are references to it in the InDesign code, there is no InDesign documentation that covers World-Ready Composer.
If you want to report issues with World-Ready Composer and InDesign, use the bug report form on Adobe.com: Feature Request/Bug Report Form.