If you move it to the right, then 2p is going to be crammed right next to 1p and 1p will be off to the left and 2p will be in middle.
Why do you need a mouse on your cab? Are you going to be playing pc games on it? If you are thinking you need it for admin purposes, I would reconsider. Your goal should be to set everything up and then never mess with it again except for minor maintenance. To do that , it would be easy to just plug a mouse in to the PC and use it. Trackballs aren't cheap, you are looking at spending between 60 and 100 bucks, thats a lot of money, and you are adding clutter to your control panel just play a few games of centipede and missile command? Hey, if you love those games and its worth it, then go ahead and do it. I decided against putting a trackball in my cab because it seems that there are only like 5 games that people generally play with a trackball: Marble Madness, Crystal Castles, Missile Command, Centipede and Golden tee. I got a trackball, then realized that I don't really like any of those games enough to justify putting a trackball on my rig. I got a x-arcade trackball controller, so if I really want to play one of those games, or am missing out on something, I can just plug it in and play it, and if I really decide later that I have to have one, I'll add it. To be honest though, a trackball would just take up space on my CP, and hardly be used. But hey, if you or your wife love those games, then by all means go for it, but I am just giving you some perspective so you don't think you have to have a trackball on your pc.