KMS
1) Let's try to simulate on a real A/C the total loss of the tail rotor on AS 332 for exemple....
2) Sometimes yes when, on the first FMS, aerodynamic was understood and reproduced by fix-wing engineer. The result was a super puma stalling like a jet fighter or flipping over on a dutch roll.
3) Some simulator can give you a kind of sea-sick, particulary if the motion system is too smooth. unfortunatly this feature is a part of the simulator design and will be probably never fixed.
4) Once a year would be perfect, doing training like emergencies, autorotations on a twin engines, fire procedures etc... All the stuff that cost so much in the real. The MCC also is very realistic on a FMS. 6 to 10 hours a year if the company can afford it.
Drakkar