Since no one is getting answers and nothing has been done to this addon for over two year it seems like it's sort of abandoned.
If it isn't it would be really nice to know how to get the monoslideshow to be the default slideshow viewer for NextGen Gallery since it's an option in this plugins settings.
It would be really nice if Alex Rabe took some time and decided if he want to update this plugin so it works for those of us that have bought the monoslidshow and are using NextGen Gallery or atleast tell us that he has abandoned this plugin.
If Alex (or someone else) solved the problems with this plugin I would gladly donate (as I'm told to do in the administration of the gallery). But since I've already payed for monoslideshow and it won't work as deafult slideshow for NextGen Gallry I consider dropping the gallery in favour for only using the monoslideshow.
Hope to get an answer pretty soon.