run as with UAC disabled

My machine is a member of a domain. I logon with a normal user account. I
need to run some apps, such as AD with a priviledged domain account. This is
another domain account with higher priviledges than my normal account. With
the UAC disabled, i use run as and the app opens, however, it appears to be
launching with local admin priviledges as it does not prompt me for
credentials. I have enabled the local security policy to prompt for
credentials rather than just run with elevated priviledges.