That sounds awful. We already have trackpoint to use a mouse in a compact device.
The printer would add so much bulk that it would no longer be a compact laptop anymore. I know you personally want one (from your recent post), but just carry a separate device or velcro it to the back of the laptop.
would you buy a compact laptop that has spacebar touch sensitivity and allows you to adjust input sensitivity, giving it dual purpose (a spacebar and a mouse)+ it has integrated A5 printer in it?