Instructables – Mouse with USB port optional internal drive/ – Why not add a USB to your mouse? There is one on your keyboard, you could potentially put one in your mouse too, but there could be some difficulties with moving your mouse with a USB key sticking out. Maybe you can put some slim USB accessories instead? Maybe a Wireless Keyboard receiver? I’m not so sure, but take a look. You can do it yourself, and it isn’t very difficult.