Thanks for these questions. Since development appears to have stopped on MCG we prefer to focus on other solutions. We have some ideas for building spline tools into RailClone, but these are only at the wish-list stage at the moment. On the other hand, some of the things shown in that video are already possible simply using the Normalise spline and Cross Section modifiers. Please take a look at the attached file for an example.
I hope that helps,