I'm sorry but despite seeing for over two decades descriptions like "on rails" or "scripted" I still don't understand their meaning in such context. Could you define phrase on rails ?
Quite frankly, of the two of us, neither has actually flown MiG-21bis. Dolphin who made the FM however did and is still active duty pilot, albeit flying now on MiG-29.
I know that it was pointed for instance that stall and spin lack in "feeling" department but having researched that, I went to Central Military Library in Warsaw and studied Flying Characteristics manual for the bis, where I have found nothing on stalls. Nothing except for single sentence that stalls and spins are strictly prohibited. So the only people who know how it might behave are those who either tested 21 in 60s or 70s or flew it.
As for the damage model. We await the moment ED releases updated damage models. Perhaps with an insight into their making we will be able to improve MiG-21.
Also, our second coder is working on CE2 issue with pilots head. Once done with it, he mentioned desire to release updates to the SPO. Once this will get close to happening, I will make a separate post since some testing will be necessary so we will ask for help.