Using extensions or the SDK to create multi-cam sequences

I had thought that this was something that just wasn't included in any of the extensibility platforms that Premiere Pro offers. This was until just the other day when I saw this video which shows that Softron have managed to get this to work. Now my best guess is that because of the way they're doing it, they've likely used a template project file and are then manually doing the rest of the steps such as syncing etc but wondered if anyone had come across this as an issue before.

And finally, would they be using the SDK to get that kind of cross-application interfacing, or could you use Vulcan for that sort of thing?

Thanks,

Paddy