Ah, Railworks double slips. I think you should read the comments under the vid you posted and maybe investigate some of the Railworks forums to see just how much of an advance (or otherwise ) these are from what we have in Trainz.
And as for the "Auran need to do this or they'll go out of business", been reading that for a good 8 years now and they're still working on Trainz.
I acknowledge that the way the slips are done is impossible, the toe of the converging rails lie in the common crossings, but they work as they should and stand up to all but the closest inspection...
I had no trouble building a whole yard of double slips, but they look pretty clunky. What assets did you use to dress up your trackwork? Frogs, guid rails etc?