What is does well:
* Starts slideshow from command line, using .sld file
* Detects changes in images, and refreshes each 'round'
* Can specify a folder, instead of a list of files
Shortcomings:
* It only picks files with lowercase extensions (.jpg, png, .gif). Uppercase doesn't work (.JPG, .PNG, .GIF)
* It does not detect directory changes each round:
- If a file disappears, it shows a black screen.
- If a file is added, it is not shown unless you restart the slideshow.
* If a folder contains another folder, or even a shortcut to a folder, it picks up files in those folders. Sometimes you don't want that.
These could be overcome with the following settings:
* Ignore extension case (maybe this is done some other way or is a bug)
* DynamicQueueDetectDirectoryChanges
* DynamicQueueAddNewImages
* DynamicQueueRemoveMissingImages
* NoSubdirectories
* NoLinkedSubdirectories
A wish list for a rainy day

Cheers