You may know this already but just in case!
Almost any object displayed on the the screen can generate a touch output when touched.
For example, if you have an image representing a button you can create a U16 output, select your image and in the inspector drill down through Touch-Stream-Output and set the signal to the output you created. You will then get a Signal on that output representing the type of touch for that image. I find that I seldom need to use a Touch Area.