Did they change Remote Execute at some point?
Previously I could run a program and it would start as LocalService with permission to change system files, edit registry HKEY_LOCAL_MACHINE keys etc.
I just tested this yesterday and it seems that's no longer the case.
Starting "cmd" and running "whoami" (Windows 7) lists the logged in user as the context.
I tried to create a file on C:\ and it was clear I didn't have permissions.
Sure, you could always do a "runas" afterwards, but I just loved how I could easliy pop up a window as LocalSystem.