How about this as a combined keyboard/mouse enhancement?
First, build a microchip detector into keyboards.
In the UK, most cats are microchipped. So if a cat approaches, the keyboard detects it and switches itself off. Phew! That saves some embarrassing emails and lost documents.
Then, just a little bit further, microchip the owner. Now they can just use their chipped hand as a pointer.
Hey TC! – Contact me for my bank details, I’m sure we can cut a deal on the patents.
(Hmm, did I mean Tim Cook or Top Cat?)