I'm sorry but I still don't understand the logic. Surely it would be much better this way:
1) Start RST
2) Start pCars 2
3) choose track + car
4) when loaded and in the garage, do your setup tweaks (or load a previous setup)
5) Insert these setup parameters into CAR PARAMETERS menu in RST (which is currently IMPOSSIBLE because you are forced to do a single lap before the menu appears, thus the first lap and session is basically thrown away and only used for bringing up the CAR PARAMETERS menu, which absolutely no sense at all in my opinion. Surely this must be a bug?).
6) Start driving and analyzing, restarting a session in the game when making setup changes.
I'm pretty sure this is a bug or you are not simply understanding what I'm trying to say. So I'll try to say it once more as clear as I can think: The 'CAR PARAMETERS' menu is _missing_ until you drive at least one full lap. It just doesn't make sense. Why not allow me to put in all my setup parameters and not waste the first lap and session?
This is NOT explained in the manual and is indeed confusing.
Once a person gets over this hump it's easy peasy. One just needs to hit the Restart Session in the game every time you do changes (not explained clearly in the otherwise brilliant manual). The CAR PARAMETERS menu does not disappear in between. It's only not there the very first time after starting the program.
I've already put the tool to good use! Managed to cut down on my laptimes for the Caterham SP300R around Oschersleben B by more than 1 second and the car feels great! I'm currently trying to figure out how to fully optimize the aero on that little car. Not sure if it's worth the effort on that front but I'm working on it.
So while I have some criticism of the new software, please know that I thoroughly enjoy it and it does indeed work as advertised and I can highly recommend it to everbody as long as you aren't scared away by some weird quirks.
EDIT (old question from a few posts up but I'd be very interested in an answer still): Why does RST only ask for the fast dampers and not the slow nor any of the rebound settings? Is it really enough data with just the fast damper? I'm thoroughly confused because PC2Tuner asked for pretty much exactly all parameters.