4.0
something...I totally gave up before Pe-2. In 4.0+, Oleg did start a new generation of "pre BoB" flight models, requiring trim to fly properly, and allowed his customers to use that trim for the first time since, what, original IL-2? For most of the life of FB/PF, this sim had no practical method of aircraft trim, but the flight models were dumbed down to match so they didn't require trimming for the online dogfight crowd.
So much for "sacred" flight models.
Now, do you want to talk here? As Oleg says: Pay attention please.