Stopping WSUS on W2K8 domain controllers

With the deployment of a third-party patch management tool,  we want to get rid of WSUS installed on domain controllers (W2K8R2). However, according to following threads, completely removing WSUS involves reboot and could corrupt registry( I also heard a rumor that WSUS shares shame database engine as AD). So I am tending to stop WSUS related services on the domain controllers and not using it. Can anyone share your experience/knowledge of how to stop/disable WSUS on a W2K8R2 domain controller? Thanks in advance!

http://social.technet.microsoft.com/Forums/en-US/winserverwsus/thread/f447e7d6-7007-4eb6-b38b-90f92525e092

http://social.technet.microsoft.com/Forums/en-US/winserverwsus/thread/97ba6745-7db0-48c7-9a9a-d0540c8afc30

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