Yes Uber Gruber , I think to change the camera view on the deck , it s in the .cam file you have to look ... You can t put the camera in the top of the deck with the Cameras.dat cause it s only the general parameters of the camera ... In the .cam file you can change the position in the submarine ...
How I know that ? I was very sad to have not the Aft camera avalable in the S 18 Class for example , so I ve the idea to rename the NSS_Gato_CR.cam in NSS_SClass_CR.cam and add NSS_Gato_CT.cam in the SClass folder after renamed it NSS_SClass_CT.cam ( was not existing ) and , after doing this , all the views from Gato are avalable in SClass
The best should be to open these .cam files and to add manualy what you want ...