Greg Reynolds from the Canadian Air and Space Museum in Ottawa has provided a tutorial on how to generate a profile for using a touchscreen. He provides much useful information which is not immediately obvious from the manual including the directory structure of Pi Presents. He takes you through editing screen.cfg which is the file that defines the layout of the touchscreen buttons and uses the radiobuttonshow template profile to show how to set up the control path between a touch and a video playing.
The tutorial is applicable to Version 1.3 (gapless). Version 1.2 (next) has detailed differences but the general principles are the same.
The tutorial is a pdf document which can be found here
The Raspberry Pi has a driver that supports touchscreens but there is little information about which touchscreens are supported. If you have successfully used a touchscreen with Pi Presents please tell us in a comment.