I was wondering if there are any ways to customize the nav bar? I want to use a nexus 7 as a car headunit, but the one thing that stumps me is volume control. The idea volume control would be to have a + and - next to the home, back, and multitask buttons on the bottom. Is there any way to do this? Or maybe put widgets anywhere on the screen, that way i can put the widget in the nav bar? I realize i may have to root.