Well it doesn't neccesarily "include" heartlining, the user still has to make the neccesary formulas to let the program heartline the track...

Why are so many people so negative about designing "perfect" elements? Like Buster said, NL is a coaster sim. Real-life coasters aren't done by hand either, you know. And saying that from now on things will be done "by a mouseclick" is just plain nonsense. Getting a ride very smooth and unique takes...

I assume like with most Intamin coasters, Stengel did the structural calculations. Stengel has been quoted as saying that G's should stay between +5 G and -1G. So I assume TTD does not go below -1G at the top