My idea is simple. Instead of stopping what we are doing to click a button to orbit a part. Then choose what type of orbit we desire. Simply right click and drag any direction on the work space to cause the body or component to orbit. It is the same way it is done with Autodesk 123D Design.
It is a smoother and more fluid workflow to move the part around. Instead of stopping to click a button. Then choosing which way to orbit the part.