Guitexture script to do something a normal key does.

Hello guys ive thought of an interesting this about the gui for touchscreen.Is there a way that you make the touch gui a button on your keyboard so that you can script for keyboard and just easily port to android?I mean like if you pres right on a guitexture it then takes it and make it into a key that is "d" so that u dont have to make another script for moving on touchscreen.If so how do i do it.thanks