As I was able to see the P15 in Ustka, I left with the following open ones:

2, "Another bug, which accounts probably to lack of variable resetting when SAMSIM is not restarted after a mission (some knobs and switches remember their settings when replayed the same SAM system).

I have finished testing in Giant reach scenario and then selected Osa in Asuluk, added missiles and targets and during start only the ona panel with SOC indicator was displayed along with an error message (Invalid procedure call) and SAMSIM quits.
Then I run SAMSIM again, selected missiles and targets (the same way as above) and everything was OK."

3, SA-8B SOC is imune to HARM <- all target acquisition radars are immune in SAMSIM, will need to think about...

5, SA-8B jamming target <- behavior corrected

7, SA-2E V-755 fuse settings are not OK/USU mode detonates even at more than 100 meters