Aces I hope that you don't think that I'm boring but I have made other two test:
The first was with normal installation like you explain in your first post, while the second test using your mod but without your NSS_Uboat7_CR.dat, io ho lasciato the urfish-NSS_Uboat7_CR.dat . By this method I know that I lost the movements of periscope, and the movements of the doors between CR and RR and between CR and other rooms but with this modification I could see that in the machine-room the diesel engine works well, and I see also another time the drops and the the fire and the smoke in the command room!
So by these tests I think that the problem of fire and drops is not your cameras.dat because this one is perfect but the problem is in your NSS_Uboat7_CR.dat
I am not a modder but for example if i open your NSS_Uboat7_CR.dat I see that there are not the nodes of drops .If you see the screenshhot of urfish-NSS_Uboat7_CR.dat you can see them here ...but I don't know where is the nodes of flames and the eletric sparks in the command room
these photo shows your mod with file with urfish-NSS_Uboat7_CR.dat

Really I don't want that you think that I'm boring

Thank for your answer!!
Ciao Desga