Mark Rossinovich (Computer God Extraordinaire) released a free Microsoft plugin that provides right-click Run-as functionality for any application.
- Download ShellRunas v1.0 from http://technet.microsoft.com/en-us/sysinternals/cc300361.aspx
- Extract ShellRunas.exe to your C:\Windows folder
- Run ShellRunas /reg from the command line to register it in the Windows shell
Now when you right-click any application a Run as and Run as different user option will be displayed in the actions menu. Sweet!