Er, that's not how flight sims work. Moving your joystick "left" rolls left. To "point left", you push your joystick left and then down and then back right (roll, pitch, roll). The model is totally different.

That very much depends on the game. I cut my teeth on the X-Wing games, where the x axis was for yaw, not roll. To roll you would hold down the top joystick button and move the stick left/right. As a result, to this day I have to remap any game which puts roll on the x axis. It just feels wrong.