I have seen a few LIRR engineers rig a chain like that described above. When I ride M-1/M-3's I usually stand at the first vestibule, so as not to be in the engineer's way. From there you can see straight out the front, and out the sides as well. Be aware that there
are some railfan-friendly engineers. One actually invited me up to the window, and said some others wouldn't have a problem if you ask them nicely........
To answer Otto's question about why they even put seats opposite the cab. I believe that seat-set can be folded up against the bulkhead when necessary. It's only an issue in the head and rear cars. The seats can be used in the other cars in the middle of the train. I guess back in the pre-M-7 era, the planners actually designed the maximum number of seats possible for the passengers; imagine that ! Yes I know, that fewer seats in the M-7 is because of Federal requirements, etc, etc.......
Dutch; That's incredible re: people suing for being allowed to witness an accident ! On the other hand, a firefighter/railfan buddy of mine once witnessed such an incident while up front, and absolutely agreed that it was the trespasser's fault. He offered his name to the Railroad Police as a witness......