Why don't we fit a duplex airspeed signal to arm the floats automatically when the airspeed falls below a certain value?
Also, we know where all the water in the world is (from the GPS), so why not incorporate a position signal so that when we're over water, the floats arm automatically?
Or why not simply fit a 'Float Arm' switch and have the highly paid offshore pilot who has very little else to do simple reach across and turn it on when coasting out?
P.S I am a highly paid, offshore AW139 pilot who performs this action on a daily basis and also sleeps well at night.