I can't find the RulerFormat SMPTE Film Sync IVTC (23.976 fps, Video) in the API. I'm having a hard time rendering exact chunks of the timeline via scripting using 23.976 fps, and thought it would help to set the time format correctly.
Nevermind... I fixed it anyway. For some reason the compiler didn't agree that 24000/1001 was the same as what Vegas is using. Although I could see that it was, and 30000/1001 for 29.97 worked, so why shouldn't 23.976? But like I said, it's working now.