Further Lu's engine/gearbox answer.
Yes the Accessory gearbox is shaft driven from the main gear box (If I remember correctly the rotor brake is also on this shaft).
Engine 2 is always connected to the main gearbox.
Engine 3 can be selected to "Main", and drive through the main gearbox, or to "Neutral" and then shut down (cruise etc).
Engine 1 can be selected to "Accessory" or "Main". Accessory is normally used at start up, so eng 1 is started and runs the accessory gearbox only, which runs one of the main generators (other is on Main g/box), and one main hydraulic pump (at least I thinks its 1, memory has obviously started to fade). After other engines are started and MGB is going, then eng 1 is switched to "Main".
Eng 3 can be shut down in flight for economy or range increase etc, but I am not aware of any operator that does this, anyone know if it's used? It has been used in this way to prove range performance to potential customers, ie turned off at the top of the climb out, and on just before descent into the airfield. With ferry tanks this does give a pretty good range (a bladder busting 8.25 hours during a demonstration workup).
As for the number of crashes, there have been 3 total write offs. PP2 - rotor brake fire (sadly also loss of crew), PP4 - tail rotor control failure (crew parachuted) and an RN variant which I don't know the cause of, but I think the crew were OK after ditching. Also PP7 had a "Heavy Landing" (or as I like to call it "a crash"), which required a major rebuild.
I don't think prez Georgie will end up with a 101, as public perception will still be of a Foreign manufacturer, no matter how much of it is built in country. where as Sikorsky is an American manufacturer, with an American design, the fact that a lot of it may be manufactured outside of the USA will probably not make it to Joe Public.