Meh. If someone is in your shed with 2 foot long croppers then nothing is stopping them. At some point you have to strike a balance between meeting insurance criteria and just building Fort Knox in your back garden.
Exactly. I pay for specific bike insurance on our contents for a reason...
I also did think that in the film they use the floor as part of the leverage equation. If the chain is in mid-air or against the wall, I'd have thought it would be more difficult to swing on the croppers.