@György-Farkas it seems setting the inputs 'fast-gpio set-input 15' as well as 16 and 17 makes the touch screen work in the dock (while omega is plugged in), but causes the touch screen to think its repeatedly being tapped without actually tapping it. The first touch works, but then the screen acts as if its being touched everywhere. For example I have three buttons which when tapped change colour, what happens is when I tap one button it changes colour and then all of a sudden the other buttons start changing colours and flickering (as if i am tapping them when I am not). (without the omega plugged in touch screen doesnt respond).
WHEREAS in the Arduino Uno (not dock) touch screen works perfectly.