Thanks, Paul. I like your solution of just copying it enough times to get it to the desired duration.
It's a pretty obvious feature request to have Photostage loop GIFs until the user wants it to advance to the next slide.
Regarding the 0.1 second transition, another obvious feature request would be to make available a cut as one of the transitions. A 0.1-second fade looks enough like a cut, so I suppose that's the solution.
Tom