This won't solve your problem, but I've had similar problems as you describe and my solution have been to copy all content in the .iso to folders with the movie name.
This makes them start faster and you don't need to use external program to make them available.
Yes, it was a tedious task, but it was worth it. Movies load a lot faster now without any problems (I also got rid of most of the menus as well)
GBPVR PC: Win7 ult x64 / Intel P Duo / 2 gb RAM / Asus Extreme Radeon HD3450 HDTV
Video: Sony 40'' LCD TV
Plugins: MovieWiz, MLpanel, Videos library, Music Spot, WebRadio - and skin: Community WS
XML is like kids. They start small and cute. Then they grow.