I won't share my .capx since it contains copyrighted art assets.
Basically just make sure the collision polygons cover your objects entirely (the defaults are often fine for this), and then overlap your objects like so.
<img src="http://i.imgur.com/0Z8Xb2T.jpg" border="0" />
Notice the right button and the go button overlap? This means if a touch input is hitting both of them, the player will move forward and turn right at the same time. It's kind of a tricky movement, since it's not as easy as using arrow keys on the keyboard, but it works.
I personally had to reduce the turning speed on touch compared to the keyboard to make it more responsive.