It would be very helpful if Dopus allowed a decimal point in slide show speed. This would allow speeds below one second.
Using a different program (Thumbsplus) I usually set it to 0.50 seconds. In cases where a photographer snaps away without much change in content, I usually set it at 0.25 or 0.35. I've even set it as quickly as 0.10 seconds, but only if overall color mood is more important than content, and I have to review hundreds of photos to find the right mood.
Of course, how quickly a program can load photos to display them plays a part in slowing down a slide show. But with smaller photos this is not an issue.
I've used FastPictureViewer in the past for this particular use case and it worked very well.
I used it with As Fast As possible settings, and I could see a movie of the images snapped by the cctv camera. It was great for occasional use.
Also, I'll add a clarification in case my first message was not detail enough. In the interface where the user selects the speed, I'm not asking for change in the number list that users navigate the small up and down arrows. I'm only asking that I be allowed to type a decimal number into the setting box and then Dopus be able to use this to set the speed.