I have an old ass ipad here running ios 9.3.5v Its about the same size as a mousepad. What if you could make an app that would make a texture on the screen that could be readeable by optical and laser mice? Maybe different sensors pick things up differently so you would need to scramble the texture in different ways to get it to be read better. Yes, you could just do images, but instant generation of a texture that is randomized would be handy. Could just be bumped in the cydia store or something.