Is there a way to add a seperate gear up and down assignment?

I use a CH USB Pro Yoke and would like to have the gear assignment to one of the toggles so that up is up and down is down. I can't find in the key assignment how to do this... only one for "landing gear" (each press cycles the gear) or "force gear down." Would it be a big PItA to make a file to accomplish this or has it already been done and I didn't use the right wording on a search?Zane