You can have as many of these 'slide shows' as you want (I think)
The problem is when each of thse becomes a 'chapter'. There is, apparently, a section on the dvd reserved for these chapters (which are part of the menu and allow viewers to goto each one). Evidently there is not enough room for more than, about 2 pages of these. I have found that if you try and add music or too many of these things the entire system freezes.
In dealing with video dvd's of home movies, for instance, I was able to burn if I kept the chapters to less than 12. For slide show stuff I have over 70 and its consistently freezing my system.
I am going to post and see if anybody else has thoughts on this one. I suspect that one might be able to delete the chapters from the menues and possibly win.
Do not count on nero support to give you any. Their stock answer to EVERYTHING is to remove the program and then re-install and this does not work (I have done it about 5 times so far)