First: well done. This is a well written and well documented product which I purchased last year and has functioned perfectly according to spec.
What would make this even better is full Javascript configuration and control. My reason is this: I write mostly dynamic web app sites. Normally I would just generate the slideshow XML on the fly on the server and therefore this would not be necessary. However recently I've been moving more and more of the user interface heavy lifting over to the client using AJAX techniques etc. So slideshow contents would be computed on the client, but there is no way to communicate that to Mono except by writing a XML file, which is not possible with Javascript.
This is certainly something on my to do list. But this will require Monoslideshow to be heavily restructured. So it's really something for a 2.0 release.