How to include subtitles in menu option

I am using Nero Vision 4, and would like to find out:

  1. How to provide a subtitle option in the menu, when burning .avi and .srt file to dvd
  2. Is it possible to allow a choice between multiple subtitle files? (If I remember right NV recognizes the .srt automatically IF the name of srt and avi are the same.
  3. In order to synchronize subs with movie, the my subs have to be delayed a few secs. Is there an option to do this in NV, or would I have to make a merged file for every subtitle first, and then simply write these to dvd?