ah, I’m not sure there is an easy way to do that. You’d need to edit the Vue app that runs the interface, and then put a compiled version of that on your microscope. Possible, but there are a few development tools required 
It’s worth mentioning that the microscope does have built-in support for a USB SNES controller, if you plug it in (before booting up the microscope) it will then give you hardware buttons for moving, autofocusing, and taking a picture. I paid about £3 for mine, it’s definitely more fun than the keyboard!