I'm running Vista 64 with a X52, and I do not remember installing Saitek's software, only the drivers.
Using that little "rotate switch" on the joystick I have set up to do exactly what you are speaking of. Mode 1, 2 and 3. It's working great for me actually.
One thing to pay attention to however is that AH likes to set modes automatically based upon what type of "craft" you are piloting/driving, so sometimes you have to rotate the mode switch to the next mode and roll it back just to reset it. (i.e. if you like Mode 3 to bomb in, and get in a bomber, AH will reset to Mode 1, so you have to roll the mode switch back to Mode 2 then up to Mode 3 for your bomber settings to activate).
If that makes sense.