Sorry Aqua, I completely misunderstood your question.
You can do it with on-on-on switch. I draw this picture, I think it should work. Please let us know if it works for real.
I'm sure it will work with the DPDT switches which I have ordered, but I already have an spdt on-off-on switch that I wanna use plus I want to rewire the mode selector on the G940 throttle which acts like an on-off-on switch.
To make the latter work I am thinking of two ways:
1) make it work through the MMjoy software. I will do it this way: Let's call the positions of the 3way switch a-b-c, a then corresponds to button 1 and c to button 2. b is the off switch so it isn't a button. What I'll do then is make a button 3 that activates when the switch moves away from the a position(=button 1 turns off) AND a button 4 that activates when the switch moves away from the c position(=button 2 turns off). So essentianly the b position will correspond to BOTH button 3 and 4 and will have to be bound twice in my game. This is not optimal but it will get the job done.
2) use NOR logic gates. If I can make this work it will be a perfect solution, but I have no experience with them and I haven't figured out exactly how the circuit should be set up so that the output of the gate gets recognised as a button (if someone can draw a circuit of how it should be set up, it would help me immensely). Nevertheless I have ordered some, so I will at least try to make it work this way.