thanks for sharing.

PowerPoint does currently not support this via AppleScript, but you 
may try to define an action and map it to the PowerPoint behaviour 
using one of the key combinations from the "PowerPoint doesn't work" 
thread.

Other than that, you could delete the mapping for the Play button for 
the PowerPoint presentation and map its functionality to "Play 
(hold)" instead. This way, your slideshow will run until you really 
want to quit it by keeping the play button pressed for a few seconds.

Also, preview 7 may have something for you ;-)

Regarding iPhoto: yes, I know there's still a lot of room for 
improvement. The behaviour that currently ships with Remote Buddy 
actually took only about 30 minutes to create and was a "last minute" 
feature. Expect more in that direction with future releases. Your 
request regarding film rolls is now on the ToDo list.

Best regards, 
Felix