Ask HN : mobile app that would be great for programmers

I'm a programmer and I constantly find myself using a small collection of the same keyboard shortcuts all the time, I would really like a mobile app which when the mobile is plugged into the pc would then provide me with a few buttons on the mobile which i could then program with multi keyboard presses, eg, i press a single touch button on the mobile and it presses cntr+tab for switching windows etc

Anyone want to take up the challenge, I'd be happy to spend up to £5 on something like this and I imagine quite a few other programmers would as well