If yes and yes then please contact him. If yes and no then it may be time you thought about it. It cannot be ignored now which is why I called it a newly opened can of worms.
There are certainly a few theatres around the country with rescue plans in place for tallescope use, and expect that number to increase in the near future. I have one which we put together about 6 months ago for use in our venue, and more importantly, we have the equipment and the trained crew who rehearse various rescue scenarios (not just tallescope use) regularly. It's pretty crucial that the written rescue plan is not the be-all and end-all - who is going to go and fetch it and follow step by step the instructions in the exceeedingly unlikely event it would be required? It is however an extremely good way of making the responsible people (those who supervise the activity), think about possible failure scenarios, how to reduce the likelihood of these occurring, and then to assess the inherent risks (including to those expected to effect a rescue), and ensure that adequate equipment, training and competent personnel are provided at all times the activity takes place (generalising again here to all rescue plans, not just specifically for tallescope use).
Of course, all rescue plans and especially those for tallescope use on stage are going to be very venue specific. You might for example have suitable perches or catwalks around the stage (see Kerry's balcony front) to which you could move (uh-oh!) the scope to effect a rescue. Or you might have a second scope or other access method to reach an incapacitated casualty in a basket, evaluate and provide 1st aid, and if REALLY necessary start the SAS games with evacuation harnesses and rope egress kits rigged from the grid overstage. There are many other (and some unfortunately more Heath Robinson-esque) ideas out there. There are also training providers (I know of at least one, I am sure there are others) who are savvy about the issue and may be able to give advice for particular circumstances.
As for the CoP Kerry, I have heard it suggested that its one potential use is to take advantage of the very thickness of the the thing and use it as a spacer to set the height of your scope outriggers...