somebody asked a similar question recently but I think he hasn't got an answer yet.
Here's what I tested today (it works ;))
I've got 6 files in the root directory of my CD:
essai1.bsi
essai2.bsi
file1.avi
file2.avi
sub1.srt
sub2.srt
the bsi files read
essai1.bsi
Code:
[Main]
NumberCDs=2
CD=1
[Movie]
Title=kindofplaylist
Directory=.
FName=file1.avi
FName2=file2.avi
[subtitles]
directory=.
sub1=sub1.srt
essai2.bsi
Code:
[Main]
NumberCDs=2
CD=2
[Movie]
Title=kindofplaylist
Directory=.
FName=file2.avi
[subtitles]
directory=.
sub1=sub2.srt
This way the videos are displayed one after another and you can set specific settings for each movie.
As far as I know, this is not possible with only one bsi file