As a non-pilot with only 23hrs in helicopters, I always thought certain things were rather silly on the 300 and R22. For instance:
1. The throttle on the collective was never a good solution. You invariably end up with the wrist-bent-as-much-as-it-can-and-hitting-the seat-and-braking-bones, without the power being fully off.
2. Why is the collective lock somewhere else but where you have your hand?
3. The cyclic could do with a lot more functions - you want all basic controls within reach there. This means radio frequency twirl knob, preset buttons, squawk knob, wheels up/down (I can imagine), landing lights etc.