I just tried plugging my Microsoft USB mouse into the car's USB port and it works. I get a little blue circular cursor, and can scroll by holding click and dragging. Also tried my Microsoft ergonomic keyboard, but that didn't work. I feel like that keyboard might be too much (it's certainly too big to be useful in the car), so maybe I'll buy a little barebones keyboard and see if that works. Anyone had luck with plugging in a keyboard?