I could reduce the height of the NavBar at the bottom by about 12%. I was thinking about doing this anyway.
If you need more screen space for an app, there is an option in the DriveLine_Settings.XML called "AppLeaveOnDesktop". If you change this from FALSE to TRUE for GMPC, the app will not be embedded when you run it. Instead, it will be left on the desktop and DriveLine will minimize when you switch to GMPC. A small DriveLine window will float along the right-side of the screen to provide access to the OSK and a way to get back to the main DriveLine interface. I've considered adding a Mute button to the this small floating DriveLine window. Try changing this setting and let me know what you think.
You're probably right about the speedometer/logo as well. Unfortunately, the tile layout is a 5x3 grid, and the speedometer/logo is a 2x2 tile. So centering it isn't really an option without a different layout and different sized tiles. All of this is just changes to the skin files.
I can make a lot of things work, but sometimes I need some suggestions for how to make it look good. So I appreciate every suggestion. Thanks!