RHEL6 -How to control X server startup options e.g. Xorg -audit

I found a post in the knowledge base showing how to set the -nolisten option.  I however need to set the -audit option when X server starts.  It is a security requirement for our Security Readiness Review checks our customer requires.  Currently for RHEL5 we use gdmsetup to set that option, however with gdmsetup deprecated for RHEL6, how do I set this option?