The tiller to the boom thing is in ST I think. I'd not thought of that one.
I'd reckon, telling em how to know which way to go, to have reduced accidental gybes down to almost nothing. We do get 180 turns on occasion but not much boom swinging.
Just because it's the right shape and the right colour and it turns up when you expect it and where you expect it - don't assume it's what you hope it is.