Hardcore pilot mode: control the thrust of each engine individually. No wheel, just three throttle meters (four on a squid). Keys Q, W, and E increase the speed of the left,center, and right engines respectively. Keys A, S, and D do the same for decreasing.
Super Hardcore pilot mode, same as above only with three more levers to adjust the angle of attack on the propeller blades, and the possibility of the engine overheating or stalling if you do it wrong.