I must confess to not having read all the posts on this thread so apologies if I repeat previous points.
The current rules re jumpseats are the first instance I know of where something overrules SAFETY in aviation, although not
unsafe, if you have a qualified pilot on board who is inthe cabin rather than on the FD is
less safe, as in the event of an emergency he could at least pull out books/call ops/ call engineering and help out in numerous other ways. I think if someone carried a qualified pilot on the
JS I think they would probably have a VERY good defence if prosecuted, that it was in the interest of safety.
Whilst I can see some sense in the locked flightdeck door (though I don't really agree with even that), I think the current rules have gone TOTALLY over the top.
n.b. I did ask BALPA for their view of this shortly after the ruling came in - I am still waiting for a reply!