There is a great option to run each avi with its own settings, just write the ini file (*.bsi) for each of your movies and play it in the bsplayer instead of *.avi
The *.bsi file is plain text file, see documentation.
For instance this might solve your requirement:
[Main]
Version=2.00
[Movie]
Title=My Great Wide Movie Avi File
Directory=.
FName=movie.avi
[Options]
FullScreen=1
PanScan=0
Aspect=16:9
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