If you need to create picture slideshows - PhotoDVD handles this.
If you already have pre-made "slideshows" in DVD (.vob) format, and having simple menu to access those "slideshows" is enough, then just load them to ConvertXtoDVD as I instructed. First .vob from each.

But if you want to create some special menu or animated menu - at the moment you need external program to do this. Most free menutools are simply accepting existing video_ts folder and let you create new menu for its contents.