power button is now. Basically yes only if you are willing to rip apart the laptop. Then there are DC-DC units that will do it. Also an inverter controller, all around these forums somewhere.
overlay for about $50 and a controller for the touchscreen for about $50. But then you will still have that crappy crappy screen. Or for $200, you can get a VGA touchscreen. That means it will run at 640x480 to 1024x768 like normal computer screen. The text wont be fuzzy and the screen will look a hell of a lot better than the thing you have now.
And if you look in the FAQ section you will find many helpful links. Also look in the Newbie section for a "new to CarPC's Look Here" thread. You will find some pretty usefull stuff there.