So I have heard a bunch of people note that they are annoyed by custom stereo installs in their Mazdas (and other cars also) because in the stock display there is no way to use the empty space left over form the radio displays (hope that makes sense).

We need a company to create a new custom replacement for that screen...

one that you can plug your laptop into, and fully customize the location, and the information displayed, colors, etc, etc. A custom full colour LCD screen that can display all the vehicles information such as speed, mileage, stereo info, direction (compass) temperature, etc, etc, etc. When you get bored, plug in your laptop and customize the colors, fonts, location on the screen for what data you want to see, etc, etc. I am willing to bet that those into seriously tweaking their cars would probably buy something like this.