Securing the cockpit - just a thought
I was thinking a while back about whether it would be possible, as a very last resort, to connect a metal wire to the cockpit door, providing a small electric shock; this would be particularly important in a situation where you were attempting an emergency landing due to a hijack situation and forced entry was being attempted.
If the lock is secure, but the handle/knob can't be touched, this may buy you a minute or two, enough to get down if you're already on finals - or close enough that you can safely deploy spoilers without too much structural damage. Is there a fuse or any element of the electrics which could be linked for this purpose; if the cabin lights were being dimmed anyway, this might provide sufficient energy for this purpose. Any thoughts as to feasibility?