Are they just ON-ON?
That could be wired like a ON-OFF by just not using one of the poles.
But, you could still wire them like ON-ON, and then set up MMJoy to send momentary signals when the switch is turned on and then again when turne off (not on). So each switch will be able to control two different buttons, but you decide which one you map, if you know what I mean...
If it's a toggle function, you just map one switch direction and use it as a on/off switch for that toggle. I.e. 'BTN22' for gear up or down. Or if it's a two way function, you map both switch directions. I.e. 'BTN22'' for gear up and 'BTN23' for gear down.