"Bit of a no brainer really but it does need advertising from time to time. I seem to remember a YouTube video a few years ago (cant find it now) where the owner of a nice shiny Cirrus took a cable in the prop, and had to deploy the BRS....
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Do you have any references for that? Not heard of any aircraft catching a winch cable in the prop, and certainly not an SR20/SR22 Cirrus if that is the aircraft you are referrring to?
Sadly, winch launch sites being shown on charts is not enough. They ought to be in the GPS driven moving map databases too. Any BGA safety people interested to encourage that to happen?