That works, but even then the controls are odd(The equip and select controls are on different parts of the joystick, the trigger isn't shoot, etc.)
Wait what MGS are you playing again?
I think it's the original Metal Gear Solid, judging from the "Revolver Ocelot" thing. I might be wrong, because I haven't played 2, but MGS and MGS2 are the only two Metal Gear games on the PC.
Since I've only played the original on the PS1, I'm not sure how useful my advice can be. All I can say is keep on playing, until you get used to the controls.