Now that I'm determined to put a trackball in the cab I'm building, it frees up the Kensington Optical Pro mouse that I've been using. I realized that the software will let you program button-presses to launch the file of your choosing. So I'm going to hack the mouse to allow buttons on the cab to quickly launch my favorite games. There are 5 buttons and 2 chorded sets that can be programmed for a total of 7 games.
Now I just have to find room to install more buttons on my cabinet

I'd love to use illuminated buttons that I can replace the insert on, but will probably just label them 1-7 and maybe have a sleeve that I can slip a printed insert in.