I don't drive Genting downhill before. But using manual tranny, I was able to overtake most of the cars with very minimum pedal work for 1 hour ++ (average speed is about 100kph from cameron to Ipoh route). The brake pad and front tyre are still working very well at the bottom of the hill.

As long as the tyre and brakepad is not overloaded, our car should be able to behave well throughout all the corners. So, the key point is cornering entry/exit positioning and speed (don't overspeed especially on high profile tyres with soft sidewalls), as well as very gentle and good control on the pedal and steering work.

Just my 2 cents