Initiate DirectToRift from code?

Hey There,

We have a game on steam and from what I understand, we can't have 2 executables for the game which the user chooses from. This means if we want to take advantage of "DirectToRift" we'd have to make that option available via an option setting in the game. Is there something I can call within the application to activate the DirectToRift video mode or are steam unity games limited to extended mode?

Thanks,

Brenden