AiAi, I don't remember both. But I used the same controller layout as the PS2 version. There are actions that are mapped to the analog functionality of the face buttons, and those are the ones I dropped. The one I remember the most is the lack of being able to pull out my gun without firing it. On the PS2, if you press the weapon button a little bit, it pulls out your equipped weapon, and doesn't fire. On the PC version, I just have the button set to fire as soon as I press it. But given the incredibly stupid manner of the PS2 way of doing it, it doesn't really hurt much. (honestly, face buttons don't make the best analog sensors).
odifiend, both of the sticks should be functional on PC. The only things that aren't are the analog face buttons. Most PSX->PC converters even have rumble.