If you have ever worked with touchscreen computers, you will certainly understand how much of a pain it is to try and double-click a desktop icon without dragging it.  As I have many kiosks in my environment currently, I hunted down how to enable the single-click option by pushing a couple registry updates with GPO (see comment by Sergio Calderón here).  The registry updates are as follows:

The second is optional, it just underlines the icon when is selected.  Little quality of life feature.