Which version of X-wing?

It really depends if there is some sort of mapping software by Saitek for the x56, you could probably (depending if you use the DOS or win versions) either map the speed preset keys to the throttle or create a virtual peripheral that unifies the stick and the throttle.

At least, most medium to high end HOTAS have similar functionalities that I know of, last I heard the Saitek software suite was a bit buggy but that was before Logitech bought them, you should probably give it a try if you haven't already.

X-wing 1998 Special Edition for Windows.

Then you have to use some software to unify the two peripherals, essentially you have to create (either with the saitek software or some third party utility like joystick gremlin) a virtual peripheral that only has axis X and Y and then Z for the throttle, disabling all the additional axis.
Also: X-wing for windows while it is more "mappable" than the DOS versions should have a button limit IIRC (it uses the same engine as X-wing vs Tie Fighter which only allowed to map something of 12/16 buttons in-game), so if you want to use all the buttons the software is needed to map them as well (just leave the trigger and "button 2" mapped in-game, in my experience mapping them with external utilities makes them act funny).
If the saitek software is anything like the CH Control Manager software of my CH hotas you should be able to map the ministicks of the X-56 as additional 4-way switches.

NOTE: in the windows version the throttle works in 1/3 steps instead of being fully analog for some reason, not unlike the way it works by using an additional utility in the dos versions (which do not support a throttle axis natively) even though the throttle in X-wing vs Tie Fighter (which uses the same engine) is fully analog.

Thanks a lot. 1/3 throttle is no problem for me. Just want eneble throttle and some of buttons that it. THX again it so much for me especially before buying x56. Game is superb but without stick and throttle is not the same.

I've got my x56 but not working on x-wing. Try to merage stick and throttle in vjoy but not working even in Windows. When install orginal Logitech Drivers and software everythink working in Windows that it. Same in CH control menager. When i try add stick and throttle there is no response in program.

Solved:) Everythink working fine. Dont need addictional program. Just need newest software from Logitech. Problem was that a had mess on my computer:) Old Thrumaster drivers and others ble.

That is exactly what I meant (I often forget Saitek is now under Logitech), glad it's working!

In additional thrrotle is setup analog.Its dream game right now.