on the side of my current MAME Cab I have 2 "pinball buttons", which also double as Coin 1, and Coin 2 keys 5 and 6 etc.. is there any way I can have other "keys" in addition to 5 & 6 function as my add coin buttons ? I have an IDE Cable hooked up into a mini pac, and while testing the free wires that arent being utilized with ultimarcs winipac i have about litterally 7 free keys.. such as : "r" etc..