I use a Magic Trackpad in the middle. But I can see how if I used a mouse or trackball, that wouldn't work as well. I also can use mouse navigation by key on a

I use a Magic Trackpad in the middle. But I can see how if I used a mouse or trackball, that wouldn't work as well. I also can use mouse navigation by key on an alternate layer. I wouldn't describe it as amazing, but it's surprisingly usable.